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

tools/binary_size/libsupersize/testdata/Console.golden

 ********************************************************************************
 Entering interactive Python shell. Quick reference:
 
-SizeInfo: Clustered, metadata, raw_symbols, section_sizes, symbols
+SizeInfo: metadata, raw_symbols, section_sizes, symbols
 Symbol: FlagsString, IsBss, IsGeneratedByToolchain, IsGroup, address, aliases, end_address, flags, full_name, generated_source, is_anonymous, name, num_aliases, object_path, padding, pss, pss_without_padding, section, section_name, size, size_without_padding, source_path, template_name
 
-SymbolGroup (extends Symbol): Clustered, CountUniqueSymbols, Filter, GroupedBy, GroupedByName, GroupedByPath, GroupedBySectionName, Inverted, IterLeafSymbols, IterUniqueSymbols, Sorted, SortedByAddress, SortedByCount, SortedByName, WhereAddressInRange, WhereFullNameMatches, WhereGeneratedByToolchain, WhereHasAnyAttribution, WhereHasPath, WhereInSection, WhereIsTemplate, WhereMatches, WhereNameMatches, WhereObjectPathMatches, WherePathMatches, WherePssBiggerThan, WhereSizeBiggerThan, WhereSourceIsGenerated, WhereSourcePathMatches, WhereTemplateNameMatches, is_sorted
+SymbolGroup (extends Symbol): CountUniqueSymbols, Filter, GroupedBy, GroupedByName, GroupedByPath, GroupedBySectionName, Inverted, IterLeafSymbols, IterUniqueSymbols, Sorted, SortedByAddress, SortedByCount, SortedByName, WhereAddressInRange, WhereFullNameMatches, WhereGeneratedByToolchain, WhereHasAnyAttribution, WhereHasPath, WhereInSection, WhereIsGroup, WhereIsTemplate, WhereMatches, WhereNameMatches, WhereObjectPathMatches, WherePathMatches, WherePssBiggerThan, WhereSizeBiggerThan, WhereSourceIsGenerated, WhereSourcePathMatches, WhereTemplateNameMatches, is_sorted
 
 SymbolDiff (extends SymbolGroup): DiffStatus, IsAdded, IsChanged, IsRemoved, IsUnchanged, WhereNotUnchanged, added_count, changed_count, removed_count, unchanged_count
 
 canned_queries: CategorizeByChromeComponent, CategorizeGenerated, TemplatesByName
 
 Functions: Diff(), Disassemble(), ExpandRegex(), Print(), ShowExamples()
 Variables: canned_queries, printed, size_info
 ********************************************************************************
 # Show pydoc for main types:
 import models
@@ skipping 17 matching lines @@
 # Note: Use "help(ExpandRegex)" for more about what {{_print_}} does.
 print_syms = size_info.symbols.WhereMatches(r"{{_print_}}")
 Print(print_syms - print_syms.WherePathMatches(r"^components/"))
 
 # Diff two .size files and save result to a file:
 Print(Diff(size_info1, size_info2), to_file="output.txt")
 
 # View per-component breakdowns, then drill into the last entry.
 c = canned_queries.CategorizeByChromeComponent()
 Print(c)
-Print(c[-1].GroupedByPath(depth=2).Clustered().Sorted())
+Print(c[-1].GroupedByPath(depth=2).Sorted())
 
 # For even more inspiration, look at canned_queries.py
 # (and feel free to add your own!).
 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/
 
 Section Sizes (Total=41.8mb (43785380 bytes)):
     .bss: 1.24mb (1300456 bytes) (not included in totals)
     .data: 99.4kb (101768 bytes) (0.2%)
     .data.rel.ro: 1.02mb (1065224 bytes) (2.4%)
     .data.rel.ro.local: 771kb (790024 bytes) (1.8%)
     .rodata: 5.65mb (5927652 bytes) (13.5%)
     .text: 34.2mb (35900712 bytes) (82.0%)
 
-Showing 49 symbols (46 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 unique paths: 9
 
 Index, Running Total, Section@Address, PSS
 ------------------------------------------------------------
 0)         16 (0.0%)  t@0x28d900   16      base/page_allocator.cc
              _GLOBAL__sub_I_page_allocator.cc
 1)         72 (0.0%)  t@0x28d910   56      base/page_allocator.cc
              _GLOBAL__sub_I_bbr_sender.cc
 2)        100 (0.0%)  t@0x28d948   28      base/page_allocator.cc
              _GLOBAL__sub_I_pacing_sender.cc
 3)        138 (0.0%)  t@0x28d964   38      base/page_allocator.cc
              extFromUUseMapping
 4)        170 (0.0%)  t@0x28d98a   32      base/page_allocator.cc
              extFromUUseMapping
-5)       5888 (0.0%)  t@0x28f000   5718    {no path}
-             ** symbol gap 0
-6)       6336 (0.0%)  t@0x28f000   448     third_party/icu/ucnv_ext.c
+5)   35830930 (81.8%) t@Group      35830760 {no path}
+             ** symbol gaps (count=3)
+6)   35831378 (81.8%) t@0x28f000   448     third_party/icu/ucnv_ext.c
              ucnv_extMatchFromU
-7)       6364 (0.0%)  t@0x28f1c8   28      third_party/icu/ucnv_ext.c
+7)   35831406 (81.8%) t@0x28f1c8   28      third_party/icu/ucnv_ext.c
              _GLOBAL__sub_I_SkDeviceProfile.cpp
-8)      75488 (0.2%)  t@0x28f1e0   69124   third_party/icu/ucnv_ext.c
+8)   35900530 (82.0%) t@0x28f1e0   69124   third_party/icu/ucnv_ext.c
              foo_bar
-9)      75512 (0.2%)  t@0x2a0000   24      {no path}
-             blink::ContiguousContainerBase::shrinkToFit
-10)     75536 (0.2%)  t@0x2a0000   24      third_party/icu/ucnv_ext.c
+9)   35900558 (82.0%) t@Group      28      {no path}
+             blink::ContiguousContainerBase::shrinkToFit (count=2)
+10)  35900582 (82.0%) t@0x2a0000   24      third_party/icu/ucnv_ext.c
              BazAlias
-11)     75540 (0.2%)  t@0x2a0010   4       third_party/{shared}/2
-             blink::ContiguousContainerBase::shrinkToFit [clone .part.1234] [clone .isra.2]
-12)     75544 (0.2%)  t@0x2a0010   4       third_party/fft_float.cc
+11)  35900586 (82.0%) t@0x2a0010   4       third_party/fft_float.cc
              FooAlias
-13)     75548 (0.2%)  t@0x2a0010   4       third_party/fft_float.cc
+12)  35900590 (82.0%) t@0x2a0010   4       third_party/fft_float.cc
              BarAlias
-14)     75576 (0.2%)  t@0x2a0020   28      third_party/container.c
+13)  35900618 (82.0%) t@0x2a0020   28      third_party/container.c
              blink::ContiguousContainerBase::ContiguousContainerBase
-15)     79616 (0.2%)  t@0x2a1000   4040    {no path}
-             ** symbol gap 1
-16)     79710 (0.2%)  t@0x2a1000   94      third_party/container.c
-             blink::PaintChunker::releasePaintChunks [clone .part.1]
-17)  35900712 (82.0%) t@0x24ca628  35821002 {no path}
-             ** symbol gap 2 (end of section)
-18)  37862696 (86.5%) r@0x266e600  1961984 {no path}
-             ** merge strings
-19)  37866121 (86.5%) r@0x284d600  3425    {no path}
+14)  35900712 (82.0%) t@0x2a1000   94      third_party/container.c
+             blink::PaintChunker::releasePaintChunks
+15)  38538681 (88.0%) r@Group      2637969 {no path}
+             ** merge strings (count=2)
+16)  38542106 (88.0%) r@0x284d600  3425    {no path}
              ** merge constants
-20)  37866124 (86.5%) r@0x284e364  3       {no path}
-             ** symbol gap 0
-21)  37866132 (86.5%) r@0x284e364  8       base/page_allocator.cc
-22)  37866176 (86.5%) r@0x284e370  44      base/page_allocator.cc
+17)  41828221 (95.5%) r@Group      3286115 {no path}
+             ** symbol gaps (count=2)
+18)  41828229 (95.5%) r@0x284e364  8       base/page_allocator.cc
+19)  41828273 (95.5%) r@0x284e370  44      base/page_allocator.cc
              Name
-23)  37866208 (86.5%) r@0x284e398  32      third_party/container.c
+20)  41828305 (95.5%) r@0x284e398  32      third_party/container.c
              chrome::mojom::FilePatcher::Name_
-24)  38542193 (88.0%) r@0x284e518  675985  {no path}
-             ** merge strings
-25)  38542248 (88.0%) r@0x28f3450  55      third_party/paint.cc
+21)  41828360 (95.5%) r@0x28f3450  55      third_party/paint.cc
              kAnimationFrameTimeHistogramClassPath
-26)  38542252 (88.0%) r@0x28f3480  4       third_party/paint.cc
+22)  41828364 (95.5%) r@0x28f3480  4       third_party/paint.cc
              blink::CSSValueKeywordsHash::findValueImpl::value_word_list
-27)  41828364 (95.5%) r@0x2c158e4  3286112 {no path}
-             ** symbol gap 1 (end of section)
-28)  41828420 (95.5%) d@0x2c176f0  56      third_party/icu/ucnv_ext.c
+23)  41828420 (95.5%) d@0x2c176f0  56      third_party/icu/ucnv_ext.c
              ChromeMainDelegate [vtable]
-29)  41828444 (95.5%) d@0x2c17728  24      third_party/icu/ucnv_ext.c
+24)  41828444 (95.5%) d@0x2c17728  24      third_party/icu/ucnv_ext.c
              chrome::mojom::FieldTrialRecorder [vtable]
-30)  42618348 (97.3%) d@0x2c17740  789904  third_party/container.c
+25)  42618348 (97.3%) d@0x2c17740  789904  third_party/container.c
              chrome::mojom::FieldTrialRecorderProxy [vtable]
-31)  42618380 (97.3%) d@0x2cd84e0  32      third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o
+26)  42618380 (97.3%) d@0x2cd84e0  32      third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o
              .Lswitch.table.45
-32)  42618388 (97.3%) d@0x2cd84f0  8       third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libport_android_jni.a_jni_utils.o
+27)  42618388 (97.3%) d@0x2cd84f0  8       third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libport_android_jni.a_jni_utils.o
              kSystemClassPrefixes
-33)  42618444 (97.3%) d@0x2cd8500  56      third_party/paint.cc
+28)  42618444 (97.3%) d@0x2cd8500  56      third_party/paint.cc
              ChromeMainDelegateAndroid [vtable]
-34)  42618468 (97.3%) d@0x2cd8538  24      base/page_allocator.cc
+29)  42618468 (97.3%) d@0x2cd8538  24      base/page_allocator.cc
              mojo::MessageReceiver [vtable]
-35)  42618480 (97.3%) d@0x2cd8550  12      base/page_allocator.cc
+30)  42618480 (97.3%) d@0x2cd8550  12      base/page_allocator.cc
              kMethodsAnimationFrameTimeHistogram
-36)  43683612 (99.8%) d@0x2ddc608  1065132 {no path}
+31)  43683612 (99.8%) d@0x2ddc608  1065132 {no path}
              ** symbol gap 0 (end of section)
-37)  43683616 (99.8%) d@0x2de7000  4       base/page_allocator.cc
+32)  43683616 (99.8%) d@0x2de7000  4       base/page_allocator.cc
              google::protobuf::internal::pLinuxKernelCmpxchg
-38)  43683620 (99.8%) d@0x2de7004  4       third_party/container.c
+33)  43683620 (99.8%) d@0x2de7004  4       third_party/container.c
              google::protobuf::internal::pLinuxKernelMemoryBarrier
-39)  43683772 (99.8%) d@0x2de7008  152     third_party/container.c
+34)  43683772 (99.8%) d@0x2de7008  152     third_party/container.c
              base::android::kBaseRegisteredMethods
-40)  43683776 (99.8%) d@0x2de70a0  4       third_party/container.c
+35)  43683776 (99.8%) d@0x2de70a0  4       third_party/container.c
              base::android::g_renderer_histogram_code
-41)  43683780 (99.8%) d@0x2de70a4  4       third_party/container.c
+36)  43683780 (99.8%) d@0x2de70a4  4       third_party/container.c
              base::android::g_library_version_number
-42)  43785380 (100.0%) d@0x2dffd88  101600  {no path}
+37)  43785380 (100.0%) d@0x2dffd88  101600  {no path}
              ** symbol gap 0 (end of section)
-43)  43785380 (100.0%) b@0x0        262144  third_party/fft_float.cc
+38)  43785380 (100.0%) b@0x0        262144  third_party/fft_float.cc
              ff_cos_131072
-44)  43785380 (100.0%) b@0x0        131072  third_party/fft_fixed.cc
+39)  43785380 (100.0%) b@0x0        131072  third_party/fft_fixed.cc
              ff_cos_131072_fixed
-45)  43785380 (100.0%) b@0x0        131072  third_party/fft_float.cc
+40)  43785380 (100.0%) b@0x0        131072  third_party/fft_float.cc
              ff_cos_65536
-46)  43785380 (100.0%) b@0x2dffda0  28      third_party/icu/ucnv_ext.c
+41)  43785380 (100.0%) b@0x2dffda0  28      third_party/icu/ucnv_ext.c
              g_chrome_content_browser_client
-47)  43785380 (100.0%) b@0x2dffe80  200     third_party/icu/ucnv_ext.c
+42)  43785380 (100.0%) b@0x2dffe80  200     third_party/icu/ucnv_ext.c
              SaveHistogram::atomic_histogram_pointer
-48)  43785380 (100.0%) b@0x2dffe84  4       third_party/icu/ucnv_ext.c
+43)  43785380 (100.0%) b@0x2dffe84  4       third_party/icu/ucnv_ext.c
              g_AnimationFrameTimeHistogram_clazz