supersize: A few fixes for Android+clang builds

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 22 matching lines @@
     .interp: 19 bytes (19 bytes)
     .note.gnu.build-id: 36 bytes (36 bytes)
     .note.gnu.gold-version: 28 bytes (28 bytes)
     .plt: 4.14kb (4244 bytes)
     .rel.dyn: 2.53mb (2655384 bytes)
     .rel.plt: 2.75kb (2816 bytes)
     .shstrtab: 436 bytes (436 bytes)
     .strtab: 33.2mb (34841854 bytes)
     .symtab: 16.4mb (17166112 bytes)
 
-Section r: has 100.0% of 5927652 bytes accounted for from 9 symbols. 0 bytes are unaccounted for.
+Section r: has 100.0% of 5927652 bytes accounted for from 10 symbols. 0 bytes are unaccounted for.
 * Padding accounts for 11 bytes (0.0%)
-* 4 placeholders (symbols that start with **) account for 5927509 bytes (100.0%)
+* 5 placeholders (symbols that start with **) account for 5927509 bytes (100.0%)
 * 0 symbols have shared ownership
 Section b: has 40.3% of 524520 bytes accounted for from 6 symbols. 775936 bytes are unaccounted for.
 * Padding accounts for 196 bytes (0.0%)
 * 0 symbols have shared ownership
 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 43 symbols (42 unique) with total pss: 43785380 bytes
+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 object files: 10
 
 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
              source_path=base/page_allocator.cc         object_path=base/base/page_allocator.o
@@ skipping 56 matching lines @@
              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]
-15)  38542106 (88.0%) r@Group      pss=2641394  padding=352  size_without_padding=2641042  count=2
+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)    1965409 (74.4%) r@0x266e600  pss=1965409  padding=0  size_without_padding=1965409
+> 0)    1961984 (74.4%) r@0x266e600  pss=1961984  padding=0  size_without_padding=1961984
                source_path=     object_path=
                flags={}  name=** merge strings
-> 1)    2641394 (100.0%) r@0x284e518  pss=675985  padding=352  size_without_padding=675633
+> 1)    2637969 (100.0%) r@0x284e518  pss=675985  padding=352  size_without_padding=675633
                source_path=     object_path=
                flags={}  name=** merge strings
-16)  41828221 (95.5%) r@Group      pss=3286115  padding=3286115  size_without_padding=0  count=2
+16)  38542106 (88.0%) r@0x284d600  pss=3425  padding=0  size_without_padding=3425
+             source_path=       object_path=
+             flags={}  name=** merge constants
+17)  41828221 (95.5%) r@Group      pss=3286115  padding=3286115  size_without_padding=0  count=2
              source_path=       object_path=
              flags={}  name=** symbol gaps
 > 0)          3 (0.0%)  r@0x284e364  pss=3  padding=3  size_without_padding=0
                source_path=     object_path=
                flags={}  name=** symbol gap 2
 > 1)    3286115 (100.0%) r@0x2c158e4  pss=3286112  padding=3286112  size_without_padding=0
                source_path=     object_path=
                flags={}  name=** symbol gap 3 (end of section)
-17)  41828229 (95.5%) r@0x284e364  pss=8  padding=0  size_without_padding=8
+18)  41828229 (95.5%) r@0x284e364  pss=8  padding=0  size_without_padding=8
              source_path=base/page_allocator.cc         object_path=base/base/page_allocator.o
-18)  41828273 (95.5%) r@0x284e370  pss=44  padding=4  size_without_padding=40
+19)  41828273 (95.5%) 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
-19)  41828305 (95.5%) r@0x284e398  pss=32  padding=0  size_without_padding=32
+20)  41828305 (95.5%) r@0x284e398  pss=32  padding=0  size_without_padding=32
              source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
              flags={}  name=chrome::mojom::FilePatcher::Name_
-20)  41828360 (95.5%) r@0x28f3450  pss=55  padding=7  size_without_padding=48
+21)  41828360 (95.5%) r@0x28f3450  pss=55  padding=7  size_without_padding=48
              source_path=third_party/paint.cc   object_path=third_party/WebKit.a/PaintChunker.o
              flags={anon}  name=kAnimationFrameTimeHistogramClassPath
-21)  41828364 (95.5%) r@0x28f3480  pss=4  padding=0  size_without_padding=4
+22)  41828364 (95.5%) r@0x28f3480  pss=4  padding=0  size_without_padding=4
              source_path=third_party/paint.cc   object_path=third_party/WebKit.a/PaintChunker.o
              flags={anon}  name=blink::CSSValueKeywordsHash::findValueImpl::value_word_list
                   full_name=blink::CSSValueKeywordsHash::findValueImpl(char const*, unsigned int)::value_word_list
-22)  41828420 (95.5%) d@0x2c176f0  pss=56  padding=0  size_without_padding=56
+23)  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]
-23)  41828444 (95.5%) d@0x2c17728  pss=24  padding=0  size_without_padding=24
+24)  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]
-24)  42618348 (97.3%) d@0x2c17740  pss=789904  padding=0  size_without_padding=789904
+25)  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]
-25)  42618380 (97.3%) d@0x2cd84e0  pss=32  padding=16  size_without_padding=16
+26)  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
-26)  42618388 (97.3%) d@0x2cd84f0  pss=8  padding=0  size_without_padding=8
+27)  42618388 (97.3%) d@0x2cd84f0  pss=8  padding=0  size_without_padding=8
              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
-27)  42618444 (97.3%) d@0x2cd8500  pss=56  padding=0  size_without_padding=56
+28)  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]
-28)  42618468 (97.3%) d@0x2cd8538  pss=24  padding=0  size_without_padding=24
+29)  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
              flags={}  name=mojo::MessageReceiver [vtable]
-29)  42618480 (97.3%) d@0x2cd8550  pss=12  padding=0  size_without_padding=12
+30)  42618480 (97.3%) d@0x2cd8550  pss=12  padding=0  size_without_padding=12
              source_path=base/page_allocator.cc         object_path=base/base/page_allocator.o
              flags={}  name=kMethodsAnimationFrameTimeHistogram
-30)  43683612 (99.8%) d@0x2ddc608  pss=1065132  padding=1065132  size_without_padding=0
+31)  43683612 (99.8%) d@0x2ddc608  pss=1065132  padding=1065132  size_without_padding=0
              source_path=       object_path=
              flags={}  name=** symbol gap 3 (end of section)
-31)  43683616 (99.8%) d@0x2de7000  pss=4  padding=0  size_without_padding=4
+32)  43683616 (99.8%) d@0x2de7000  pss=4  padding=0  size_without_padding=4
              source_path=base/page_allocator.cc         object_path=base/base/page_allocator.o
              flags={}  name=google::protobuf::internal::pLinuxKernelCmpxchg
-32)  43683620 (99.8%) d@0x2de7004  pss=4  padding=0  size_without_padding=4
+33)  43683620 (99.8%) d@0x2de7004  pss=4  padding=0  size_without_padding=4
              source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
              flags={}  name=google::protobuf::internal::pLinuxKernelMemoryBarrier
-33)  43683772 (99.8%) d@0x2de7008  pss=152  padding=0  size_without_padding=152
+34)  43683772 (99.8%) d@0x2de7008  pss=152  padding=0  size_without_padding=152
              source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
              flags={rel}  name=base::android::kBaseRegisteredMethods
-34)  43683776 (99.8%) d@0x2de70a0  pss=4  padding=0  size_without_padding=4
+35)  43683776 (99.8%) d@0x2de70a0  pss=4  padding=0  size_without_padding=4
              source_path=third_party/container.c        object_path=third_party/WebKit.a/ContiguousContainer.o
              flags={anon}  name=base::android::g_renderer_histogram_code
-35)  43683780 (99.8%) d@0x2de70a4  pss=4  padding=0  size_without_padding=4
+36)  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
              flags={anon,rel.loc}  name=base::android::g_library_version_number
-36)  43785380 (100.0%) d@0x2dffd88  pss=101600  padding=101600  size_without_padding=0
+37)  43785380 (100.0%) d@0x2dffd88  pss=101600  padding=101600  size_without_padding=0
              source_path=       object_path=
              flags={}  name=** symbol gap 3 (end of section)
-37)  43785380 (100.0%) b@0x0        pss=262144  padding=0  size_without_padding=262144
+38)  43785380 (100.0%) b@0x0        pss=262144  padding=0  size_without_padding=262144
              source_path=third_party/fft_float.cc       object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o
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-38)  43785380 (100.0%) b@0x0        pss=131072  padding=0  size_without_padding=131072
+39)  43785380 (100.0%) b@0x0        pss=131072  padding=0  size_without_padding=131072
              source_path=third_party/fft_fixed.cc       object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_fixed.o
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-39)  43785380 (100.0%) b@0x0        pss=131072  padding=0  size_without_padding=131072
+40)  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
              flags={}  name=ff_cos_65536
-40)  43785380 (100.0%) b@0x2dffda0  pss=28  padding=0  size_without_padding=28
+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
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-41)  43785380 (100.0%) b@0x2dffe80  pss=200  padding=196  size_without_padding=4
+42)  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
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              source_path=third_party/icu/ucnv_ext.c     object_path=third_party/icu/icuuc/ucnv_ext.o
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