Supersize: Add "hot." to list of linker prefixes.

I think this started appearing when we added AFDO profiles.

Change-Id: Icc17e00411368d3bd51ba6d3844e35228523e2e5
Reviewed-on: https://chromium-review.googlesource.com/848034Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526768}

tools/binary_size/libsupersize/archive.py

@@ -72,6 +72,9 @@ def _StripLinkerAddedSymbolPrefixes(raw_symbols):
     elif full_name.startswith('rel.'):
       symbol.flags |= models.FLAG_REL
       symbol.full_name = full_name[4:]
+    elif full_name.startswith('hot.'):
+      symbol.flags |= models.FLAG_HOT
+      symbol.full_name = full_name[4:]
 
 
 def _NormalizeNames(raw_symbols):

tools/binary_size/libsupersize/models.py

@@ -89,6 +89,7 @@ FLAG_REL = 8
 FLAG_REL_LOCAL = 16
 FLAG_GENERATED_SOURCE = 32
 FLAG_CLONE = 64
+FLAG_HOT = 128
 
 
 DIFF_STATUS_UNCHANGED = 0
@@ -247,6 +248,8 @@ class BaseSymbol(object):
       parts.append('gen')
     if flags & FLAG_CLONE:
       parts.append('clone')
+    if flags & FLAG_HOT:
+      parts.append('hot')
     return '{%s}' % ','.join(parts)
 
   def IsBss(self):

tools/binary_size/libsupersize/testdata/test.map

@@ -92,7 +92,7 @@ Memory map
  .text._ZN5blink23ContiguousContainerBase11shrinkToFitEv
                 0x002a0000       0x10 obj/third_party/WebKit.a(PaintChunker.o)
                 0x002a0001                blink::ContiguousContainerBase::shrinkToFit()
- .text._ZN5blink23ContiguousContainerBase11shrinkToFitEv2
+ .text.hot._ZN5blink23ContiguousContainerBase11shrinkToFitEv2
                 0x002a0010       0xc obj/third_party/WebKit.a(PaintChunker.o)
                 0x002a0011                blink::ContiguousContainerBase::shrinkToFit() [clone .part.1234] [clone .isra.2]
  .text._ZN5blink23ContiguousContainerBaseC2EOS0_