supersize: Move [clone] from name -> flags & rewrite Cluster()

tools/binary_size/libsupersize/testdata/FullDescription.golden

 Metadata:
     elf_arch=arm
     elf_build_id=WhatAnAmazingBuildId
     elf_file_name=elf
     elf_mtime={redacted}
     git_revision=abc123
     gn_args=var1=true var2="foo"
     map_file_name=../test.map
     tool_prefix=tools/binary_size/libsupersize/testdata/mock_toolchain/
 
@@ skipping 39 matching lines @@
 Section d: has 100.0% of 1957016 bytes accounted for from 15 symbols. 0 bytes are unaccounted for.
 * Padding accounts for 16 bytes (0.0%)
 * 2 placeholders (symbols that start with **) account for 1166732 bytes (59.6%)
 * 0 symbols have shared ownership
 Section t: has 100.0% of 35900712 bytes accounted for from 18 symbols. 0 bytes are unaccounted for.
 * Padding accounts for 48 bytes (0.0%)
 * 3 placeholders (symbols that start with **) account for 35830760 bytes (99.8%)
 * Contains 5 aliases, mapped to 2 unique addresses (60 bytes)
 * 1 symbols have shared ownership (12 bytes)
 
+Showing 49 symbols (46 unique) with total pss: 43785380 bytes
+.text=34.2mb     .rodata=5.65mb     .data*=1.87mb     .bss=512kb      total=41.8mb
+Number of unique paths: 9
+
+Index, Running Total, Section@Address, PSS
+------------------------------------------------------------
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+             source_path=base/page_allocator.cc         object_path=base/base/page_allocator.o
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+             source_path=base/page_allocator.cc         object_path=base/base/page_allocator.o
+             flags={startup}  name=_GLOBAL__sub_I_pacing_sender.cc
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+             source_path=base/page_allocator.cc         object_path=base/base/page_allocator.o
+             flags={}  name=extFromUUseMapping
+                  full_name=extFromUUseMapping(signed char, unsigned int, int)
+4)        170 (0.0%)  t@0x28d98a   pss=32  padding=0  size_without_padding=32
+             source_path=base/page_allocator.cc         object_path=base/base/page_allocator.o
+             flags={}  name=extFromUUseMapping
+                  full_name=extFromUUseMapping(aj, int)
+5)       5888 (0.0%)  t@0x28f000   pss=5718  padding=5718  size_without_padding=0
+             source_path=       object_path=
+             flags={}  name=** symbol gap 0
+6)       6336 (0.0%)  t@0x28f000   pss=448  padding=0  size_without_padding=448
+             source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
+             flags={gen}  name=ucnv_extMatchFromU
+                  full_name=ucnv_extMatchFromU(int const*, int, unsigned short const*, int, unsigned short const*, int, unsigned int*, signed char, signed char)
+7)       6364 (0.0%)  t@0x28f1c8   pss=28  padding=8  size_without_padding=20
+             source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
+             flags={startup,gen}  name=_GLOBAL__sub_I_SkDeviceProfile.cpp
+8)      75488 (0.2%)  t@0x28f1e0   pss=69124  padding=4  size_without_padding=69120
+             source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
+             flags={unlikely,gen}  name=foo_bar
+9)      75512 (0.2%)  t@0x2a0000   pss=24  padding=32  size_without_padding=16
+             source_path=       object_path=
+             flags={2 aliases}  name=blink::ContiguousContainerBase::shrinkToFit
+                  full_name=blink::ContiguousContainerBase::shrinkToFit()
+10)     75536 (0.2%)  t@0x2a0000   pss=24  padding=32  size_without_padding=16
+             source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
+             flags={gen,2 aliases}  name=BazAlias
+                  full_name=BazAlias(bool)
+11)     75540 (0.2%)  t@0x2a0010   pss=4  padding=0  size_without_padding=12
+             source_path=third_party/{shared}/2         object_path=third_party/{shared}/2
+             flags={clone,3 aliases}  name=blink::ContiguousContainerBase::shrinkToFit
+                  full_name=blink::ContiguousContainerBase::shrinkToFit()
+12)     75544 (0.2%)  t@0x2a0010   pss=4  padding=0  size_without_padding=12
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+             flags={3 aliases}  name=FooAlias
+                  full_name=FooAlias()
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+             source_path=third_party/fft_float.cc       object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o
+             flags={3 aliases}  name=BarAlias
+                  full_name=BarAlias()
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+             source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
+             flags={}  name=blink::ContiguousContainerBase::ContiguousContainerBase
+                  full_name=blink::ContiguousContainerBase::ContiguousContainerBase(blink::ContiguousContainerBase&&)
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+             source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
+             flags={anon,clone}  name=blink::PaintChunker::releasePaintChunks
+                  full_name=blink::PaintChunker::releasePaintChunks()
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+             source_path=       object_path=
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+18)  37862696 (86.5%) r@0x266e600  pss=1961984  padding=0  size_without_padding=1961984
+             source_path=       object_path=
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+19)  37866121 (86.5%) r@0x284d600  pss=3425  padding=0  size_without_padding=3425
+             source_path=       object_path=
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+20)  37866124 (86.5%) r@0x284e364  pss=3  padding=3  size_without_padding=0
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+21)  37866132 (86.5%) r@0x284e364  pss=8  padding=0  size_without_padding=8
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+22)  37866176 (86.5%) r@0x284e370  pss=44  padding=4  size_without_padding=40
+             source_path=base/page_allocator.cc         object_path=base/base/page_allocator.o
+             flags={}  name=Name
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+             flags={}  name=chrome::mojom::FilePatcher::Name_
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+             flags={anon}  name=blink::CSSValueKeywordsHash::findValueImpl::value_word_list
+                  full_name=blink::CSSValueKeywordsHash::findValueImpl(char const*, unsigned int)::value_word_list
+27)  41828364 (95.5%) r@0x2c158e4  pss=3286112  padding=3286112  size_without_padding=0
+             source_path=       object_path=
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+28)  41828420 (95.5%) d@0x2c176f0  pss=56  padding=0  size_without_padding=56
+             source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
+             flags={gen}  name=ChromeMainDelegate [vtable]
+29)  41828444 (95.5%) d@0x2c17728  pss=24  padding=0  size_without_padding=24
+             source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
+             flags={gen}  name=chrome::mojom::FieldTrialRecorder [vtable]
+30)  42618348 (97.3%) d@0x2c17740  pss=789904  padding=0  size_without_padding=789904
+             source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
+             flags={}  name=chrome::mojom::FieldTrialRecorderProxy [vtable]
+31)  42618380 (97.3%) d@0x2cd84e0  pss=32  padding=16  size_without_padding=16
+             source_path=       object_path=third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o
+             flags={}  name=.Lswitch.table.45
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+             source_path=       object_path=third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libport_android_jni.a_jni_utils.o
+             flags={anon}  name=kSystemClassPrefixes
+33)  42618444 (97.3%) d@0x2cd8500  pss=56  padding=0  size_without_padding=56
+             source_path=third_party/paint.cc   object_path=third_party/WebKit.a/PaintChunker.o
+             flags={}  name=ChromeMainDelegateAndroid [vtable]
+34)  42618468 (97.3%) d@0x2cd8538  pss=24  padding=0  size_without_padding=24
+             source_path=base/page_allocator.cc         object_path=base/base/page_allocator.o
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+             flags={}  name=google::protobuf::internal::pLinuxKernelCmpxchg
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+             source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
+             flags={}  name=google::protobuf::internal::pLinuxKernelMemoryBarrier
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+             source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
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+             source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
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+41)  43683780 (99.8%) d@0x2de70a4  pss=4  padding=0  size_without_padding=4
+             source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
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+44)  43785380 (100.0%) b@0x0        pss=131072  padding=0  size_without_padding=131072
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+             flags={}  name=ff_cos_131072_fixed
+45)  43785380 (100.0%) b@0x0        pss=131072  padding=0  size_without_padding=131072
+             source_path=third_party/fft_float.cc       object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o
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+46)  43785380 (100.0%) b@0x2dffda0  pss=28  padding=0  size_without_padding=28
+             source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
+             flags={gen}  name=g_chrome_content_browser_client
+47)  43785380 (100.0%) b@0x2dffe80  pss=200  padding=196  size_without_padding=4
+             source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
+             flags={gen}  name=SaveHistogram::atomic_histogram_pointer
+                  full_name=SaveHistogram(_JNIEnv*, base::android::JavaParamRef<_jobject*> const&, base::android::JavaParamRef<_jstring*> const&, base::android::JavaParamRef<_jlongArray*> const&, int)::atomic_histogram_pointer
+48)  43785380 (100.0%) b@0x2dffe84  pss=4  padding=0  size_without_padding=4
+             source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
+             flags={anon,gen}  name=g_AnimationFrameTimeHistogram_clazz
 Showing 44 symbols (43 unique) with total pss: 43785380 bytes
 .text=34.2mb     .rodata=5.65mb     .data*=1.87mb     .bss=512kb      total=41.8mb
 Number of unique paths: 9
 
 Index, Running Total, Section@Address, PSS
 ------------------------------------------------------------
 0)         16 (0.0%)  t@0x28d900   pss=16  padding=0  size_without_padding=16
              source_path=base/page_allocator.cc         object_path=base/base/page_allocator.o
              flags={startup}  name=_GLOBAL__sub_I_page_allocator.cc
 1)         72 (0.0%)  t@0x28d910   pss=56  padding=0  size_without_padding=56
@@ skipping 35 matching lines @@
 9)   35900558 (82.0%) t@Group      pss=28  padding=32  size_without_padding=28  count=2
              source_path=       object_path=
              flags={}  name=blink::ContiguousContainerBase::shrinkToFit
                   full_name=blink::ContiguousContainerBase::shrinkToFit()
 > 0)         24 (85.7%) t@0x2a0000   pss=24  padding=32  size_without_padding=16
                source_path=     object_path=
                flags={2 aliases}  name=blink::ContiguousContainerBase::shrinkToFit
                     full_name=blink::ContiguousContainerBase::shrinkToFit()
 > 1)         28 (100.0%) t@0x2a0010   pss=4  padding=0  size_without_padding=12
                source_path=third_party/{shared}/2       object_path=third_party/{shared}/2
-               flags={3 aliases}  name=blink::ContiguousContainerBase::shrinkToFit [clone .part.1234] [clone .isra.2]
-                    full_name=blink::ContiguousContainerBase::shrinkToFit() [clone .part.1234] [clone .isra.2]
+               flags={clone,3 aliases}  name=blink::ContiguousContainerBase::shrinkToFit
+                    full_name=blink::ContiguousContainerBase::shrinkToFit()
 10)  35900582 (82.0%) t@0x2a0000   pss=24  padding=32  size_without_padding=16
              source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
              flags={gen,2 aliases}  name=BazAlias
                   full_name=BazAlias(bool)
 11)  35900586 (82.0%) t@0x2a0010   pss=4  padding=0  size_without_padding=12
              source_path=third_party/fft_float.cc       object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o
              flags={3 aliases}  name=FooAlias
                   full_name=FooAlias()
 12)  35900590 (82.0%) t@0x2a0010   pss=4  padding=0  size_without_padding=12
              source_path=third_party/fft_float.cc       object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o
              flags={3 aliases}  name=BarAlias
                   full_name=BarAlias()
 13)  35900618 (82.0%) t@0x2a0020   pss=28  padding=4  size_without_padding=24
              source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
              flags={}  name=blink::ContiguousContainerBase::ContiguousContainerBase
                   full_name=blink::ContiguousContainerBase::ContiguousContainerBase(blink::ContiguousContainerBase&&)
 14)  35900712 (82.0%) t@0x2a1000   pss=94  padding=0  size_without_padding=94
              source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
-             flags={anon}  name=blink::PaintChunker::releasePaintChunks [clone .part.1]
-                  full_name=blink::PaintChunker::releasePaintChunks() [clone .part.1]
+             flags={anon,clone}  name=blink::PaintChunker::releasePaintChunks
+                  full_name=blink::PaintChunker::releasePaintChunks()
 15)  38538681 (88.0%) r@Group      pss=2637969  padding=352  size_without_padding=2637617  count=2
              source_path=       object_path=
              flags={}  name=** merge strings
 > 0)    1961984 (74.4%) r@0x266e600  pss=1961984  padding=0  size_without_padding=1961984
                source_path=     object_path=
                flags={}  name=** merge strings
 > 1)    2637969 (100.0%) r@0x284e518  pss=675985  padding=352  size_without_padding=675633
                source_path=     object_path=
                flags={}  name=** merge strings
 16)  38542106 (88.0%) r@0x284d600  pss=3425  padding=0  size_without_padding=3425
@@ skipping 80 matching lines @@
 41)  43785380 (100.0%) b@0x2dffda0  pss=28  padding=0  size_without_padding=28
              source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
              flags={gen}  name=g_chrome_content_browser_client
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              flags={gen}  name=SaveHistogram::atomic_histogram_pointer
                   full_name=SaveHistogram(_JNIEnv*, base::android::JavaParamRef<_jobject*> const&, base::android::JavaParamRef<_jstring*> const&, base::android::JavaParamRef<_jlongArray*> const&, int)::atomic_histogram_pointer
 43)  43785380 (100.0%) b@0x2dffe84  pss=4  padding=0  size_without_padding=4
              source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
              flags={anon,gen}  name=g_AnimationFrameTimeHistogram_clazz