supersize: Tweak diff symbol matching for generated symbols

tools/binary_size/libsupersize/models.py

 # Copyright 2017 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """Classes that comprise the data model for binary size analysis.
 
 The primary classes are Symbol, and SymbolGroup.
 
 Description of common properties:
   * address: The start address of the symbol.
         May be 0 (e.g. for .bss or for SymbolGroups).
@@ skipping 39 matching lines @@
     't': '.text',
 }
 
 FLAG_ANONYMOUS = 1
 FLAG_STARTUP = 2
 FLAG_UNLIKELY = 4
 FLAG_REL = 8
 FLAG_REL_LOCAL = 16
 
 
-def _StripCloneSuffix(name):
-  clone_idx = name.find(' [clone ')
-  if clone_idx != -1:
-    return name[:clone_idx]
-  return name
-
-
 class SizeInfo(object):
   """Represents all size information for a single binary.
 
   Fields:
     section_sizes: A dict of section_name -> size.
     symbols: A SymbolGroup containing all symbols, sorted by address.
     metadata: A dict.
   """
   __slots__ = (
       'section_sizes',
@@ skipping 94 matching lines @@
     return self.section_name == '.bss'
 
   def IsGroup(self):
     return False
 
   def IsGenerated(self):
     # TODO(agrieve): Also match generated functions such as:
     #     startup._GLOBAL__sub_I_page_allocator.cc
     return self.name.endswith(']') and not self.name.endswith('[]')
 
-  def _Key(self):
-    """Returns a tuple that can be used to see if two Symbol are the same.
-
-    Keys are not guaranteed to be unique within a SymbolGroup. For example, it
-    is common to have multiple "** merge strings" symbols, which will have a
-    common key."""
-    stripped_full_name = self.full_name
-    if stripped_full_name:
-      stripped_full_name = _StripCloneSuffix(stripped_full_name)
-    return (self.section_name, stripped_full_name or self.name)
-
 
 class Symbol(BaseSymbol):
   """Represents a single symbol within a binary.
 
   Refer to module docs for field descriptions.
   """
 
   __slots__ = (
       'address',
       'full_name',
@@ skipping 510 matching lines @@
 
 def _ExtractPrefixBeforeSeparator(string, separator, count=1):
   idx = -len(separator)
   prev_idx = None
   for _ in xrange(count):
     idx = string.find(separator, idx + len(separator))
     if idx < 0:
       break
     prev_idx = idx
   return string[:prev_idx]