supersize: Sort diffs by default

tools/binary_size/libsupersize/diff.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.
 """Logic for diffing two SizeInfo objects."""
 
 import collections
 import re
 
 import models
 
@@ skipping 162 matching lines @@
   for section_name, padding in padding_by_section_name.iteritems():
     if padding != 0:
       similar.append(models.Symbol(
           section_name, padding,
           name="** aggregate padding of diff'ed symbols"))
   return models.SymbolDiff(
       added, removed, similar, name=after.name, full_name=after.full_name,
       section_name=after.section_name)
 
 
-def Diff(before, after, cluster=True):
-  """Diffs two SizeInfo objects. Returns a SizeInfoDiff.
-
-  Args:
-    cluster: When True, calls SymbolGroup.Cluster() after diffing. This
-        generally reduces noise.
-  """
+def Diff(before, after):
+  """Diffs two SizeInfo objects. Returns a SizeInfoDiff."""
   assert isinstance(before, models.SizeInfo)
   assert isinstance(after, models.SizeInfo)
   section_sizes = {k: after.section_sizes[k] - v
                    for k, v in before.section_sizes.iteritems()}
   symbol_diff = _DiffSymbolGroups(before.symbols, after.symbols)
-  if cluster:
-    symbol_diff = symbol_diff.Cluster()
   return models.SizeInfoDiff(section_sizes, symbol_diff, before.metadata,
                              after.metadata)