supersize: Track symbol aliases and shared symbols

tools/binary_size/libsupersize/testdata/Console.golden

 # Show pydoc for main types:
 import models
 help(models)
 
 # Show all attributes of all symbols & per-section totals:
 Print(size_info, verbose=True)
 
 # Show two levels of .text, grouped by first two subdirectories
 text_syms = size_info.symbols.WhereInSection("t")
 by_path = text_syms.GroupBySourcePath(depth=2)
 Print(by_path.WhereBiggerThan(1024))
 
 # Show all non-vtable generated symbols
 generated_syms = size_info.symbols.WhereIsGenerated()
 Print(generated_syms.WhereNameMatches(r"vtable").Inverted())
 
 # Show all symbols that have "print" in their name or path, except
 # those within components/.
 # Note: Could have also used Inverted(), as above.
 # 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")
 
 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
 
 Section Sizes (Total=43,785,380 bytes):
     .bss: 1,300,456 bytes (not included in totals)
     .data: 101,768 bytes (0.2%)
     .data.rel.ro: 1,065,224 bytes (2.4%)
     .data.rel.ro.local: 790,024 bytes (1.8%)
     .rodata: 5,927,652 bytes (13.5%)
     .text: 35,900,712 bytes (82.0%)
 
-Showing 38 symbols with total size: 2652506 bytes
-.text=10.3kb     .rodata=2.52mb     other=388 bytes  total=2.53mb
+Showing 41 symbols with total pss: 4036054 bytes
+.text=77.8kb     .rodata=2.52mb     other=1.25mb     total=3.85mb
 Number of object files: 10
 
-First columns are: running total, type, size
+First columns are: running total, address, pss
  2641394 r@Group      2641394 {no path}
              ** merge strings (count=2)
- 2651152 t@Group      9758    {no path}
+ 3431298 d@0x2c17740  789904  third_party/container.c
+             chrome::mojom::FieldTrialRecorderProxy [vtable]
+ 3500422 t@0x28f1e0   69124   third_party/icu/ucnv_ext.c
+             foo_bar
+ 3510180 t@Group      9758    {no path}
              ** symbol gaps (count=2)
- 2651600 t@0x28f000   448     third_party/icu/ucnv_ext.c
+ 3510628 t@0x28f000   448     third_party/icu/ucnv_ext.c
              ucnv_extMatchFromU
- 2651752 d@0x2de7008  152     third_party/container.c
+ 3510780 d@0x2de7008  152     third_party/container.c
              base::android::kBaseRegisteredMethods
- 2651846 t@0x2a1000   94      third_party/container.c
+ 3510874 t@0x2a1000   94      third_party/container.c
              blink::PaintChunker::releasePaintChunks [clone .part.1]
- 2651902 d@0x2c176f0  56      third_party/icu/ucnv_ext.c
+ 3510930 d@0x2c176f0  56      third_party/icu/ucnv_ext.c
              ChromeMainDelegate [vtable]
- 2651958 d@0x2cd8500  56      third_party/paint.cc
+ 3510986 d@0x2cd8500  56      third_party/paint.cc
              ChromeMainDelegateAndroid [vtable]
- 2652014 t@0x28d910   56      base/page_allocator.cc
+ 3511042 t@0x28d910   56      base/page_allocator.cc
              _GLOBAL__sub_I_bbr_sender.cc
- 2652069 r@0x28f3450  55      third_party/paint.cc
+ 3511097 r@0x28f3450  55      third_party/paint.cc
              kAnimationFrameTimeHistogramClassPath
- 2652113 r@0x284e370  44      base/page_allocator.cc
+ 3511121 t@0x2a0000   24      third_party/icu/ucnv_ext.c
+             BazAlias
+ 3511145 t@0x2a0000   24      {no path}
+             blink::ContiguousContainerBase::shrinkToFit
+ 3511189 r@0x284e370  44      base/page_allocator.cc
              Name
- 2652151 t@0x28d964   38      base/page_allocator.cc
+ 3511227 t@0x28d964   38      base/page_allocator.cc
              extFromUUseMapping
- 2652183 r@0x284e398  32      third_party/container.c
+ 3511259 d@0x2cd84e0  32      third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o
+             .Lswitch.table.45
+ 3511291 r@0x284e398  32      third_party/container.c
              chrome::mojom::FilePatcher::Name_
- 2652215 t@0x28d98a   32      base/page_allocator.cc
+ 3511323 t@0x28d98a   32      base/page_allocator.cc
              extFromUUseMapping
- 2652243 t@0x28f1c8   28      third_party/icu/ucnv_ext.c
+ 3511351 t@0x28f1c8   28      third_party/icu/ucnv_ext.c
              _GLOBAL__sub_I_SkDeviceProfile.cpp
- 2652271 t@0x28d948   28      base/page_allocator.cc
+ 3511379 t@0x28d948   28      base/page_allocator.cc
              _GLOBAL__sub_I_pacing_sender.cc
- 2652299 t@0x2a0020   28      third_party/container.c
+ 3511407 t@0x2a0020   28      third_party/container.c
              blink::ContiguousContainerBase::ContiguousContainerBase
- 2652323 d@0x2c17740  24      third_party/container.c
-             chrome::mojom::FieldTrialRecorderProxy [vtable]
- 2652347 d@0x2c17728  24      third_party/icu/ucnv_ext.c
-             chrome::mojom::FieldTrialRecorderRequestValidator [vtable]
- 2652371 t@0x28f1e0   24      third_party/icu/ucnv_ext.c
-             foo_bar
- 2652395 d@0x2cd8538  24      base/page_allocator.cc
+ 3511431 d@0x2c17728  24      third_party/icu/ucnv_ext.c
+             chrome::mojom::FieldTrialRecorder [vtable]
+ 3511455 d@0x2cd8538  24      base/page_allocator.cc
              mojo::MessageReceiver [vtable]
- 2652411 d@0x2cd84e0  16      third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o
-             .Lswitch.table.45
- 2652427 t@0x28d900   16      base/page_allocator.cc
+ 3511471 t@0x28d900   16      base/page_allocator.cc
              _GLOBAL__sub_I_page_allocator.cc
- 2652443 t@0x2a0000   16      third_party/paint.cc
-             blink::ContiguousContainerBase::shrinkToFit
- 2652455 t@0x2a0010   12      third_party/paint.cc
+ 3511475 t@0x2a0010   4       third_party/fft_float.cc
+             BarAlias
+ 3511479 t@0x2a0010   4       third_party/fft_float.cc
+             FooAlias
+ 3511483 t@0x2a0010   4       third_party/{shared}/2
              blink::ContiguousContainerBase::shrinkToFit [clone .part.1234] [clone .isra.2]
- 2652467 d@0x2cd8550  12      base/page_allocator.cc
+ 3511495 d@0x2cd8550  12      base/page_allocator.cc
              kMethodsAnimationFrameTimeHistogram
- 2652478 r@0x284e364  11      base/page_allocator.cc
- 2652486 d@0x2cd84f0  8       third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libport_android_jni.a_jni_utils.o
+ 3511506 r@0x284e364  11      base/page_allocator.cc
+ 3511514 d@0x2cd84f0  8       third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libport_android_jni.a_jni_utils.o
              kSystemClassPrefixes
- 2652490 d@0x2de70a4  4       third_party/container.c
+ 3511518 d@0x2de70a4  4       third_party/container.c
              base::android::g_library_version_number
- 2652494 d@0x2de70a0  4       third_party/container.c
+ 3511522 d@0x2de70a0  4       third_party/container.c
              base::android::g_renderer_histogram_code
- 2652498 r@0x28f3480  4       third_party/paint.cc
+ 3511526 r@0x28f3480  4       third_party/paint.cc
              blink::CSSValueKeywordsHash::findValueImpl::value_word_list
- 2652502 d@0x2de7000  4       base/page_allocator.cc
+ 3511530 d@0x2de7000  4       base/page_allocator.cc
              google::protobuf::internal::pLinuxKernelCmpxchg
- 2652506 d@0x2de7004  4       third_party/container.c
+ 3511534 d@0x2de7004  4       third_party/container.c
              google::protobuf::internal::pLinuxKernelMemoryBarrier
- 2652506 b@0x0        262144  third_party/fft_float.cc
+ 3511534 b@0x0        262144  third_party/fft_float.cc
              ff_cos_131072
- 2652506 b@0x0        131072  third_party/fft_fixed.cc
+ 3511534 b@0x0        131072  third_party/fft_fixed.cc
              ff_cos_131072_fixed
- 2652506 b@0x0        131072  third_party/fft_float.cc
+ 3511534 b@0x0        131072  third_party/fft_float.cc
              ff_cos_65536
- 2652506 b@0x2dffe80  200     third_party/icu/ucnv_ext.c
+ 3511534 b@0x2dffe80  200     third_party/icu/ucnv_ext.c
              SaveHistogram::atomic_histogram_pointer
- 2652506 b@0x2dffda0  28      third_party/icu/ucnv_ext.c
+ 3511534 b@0x2dffda0  28      third_party/icu/ucnv_ext.c
              g_chrome_content_browser_client
- 2652506 b@0x2dffe84  4       third_party/icu/ucnv_ext.c
+ 3511534 b@0x2dffe84  4       third_party/icu/ucnv_ext.c
              g_AnimationFrameTimeHistogram_clazz