base/allocator: Hardcode TCMalloc debug optimization level to 2 on Linux.

base/allocator/allocator.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'tcmalloc_dir': '../../third_party/tcmalloc/chromium',
     'use_vtable_verify%': 0,
   },
   'targets': [
@@ skipping 288 matching lines @@
           'msvs_settings': {
             'VCCLCompilerTool': {
               'RuntimeLibrary': '0',
             },
           },
           'variables': {
             # Provide a way to force disable debugallocation in Debug builds,
             # e.g. for profiling (it's more rare to profile Debug builds,
             # but people sometimes need to do that).
             'disable_debugallocation%': 0,
+            'debug_optimize': 2,

[Nico, 2014/08/02 00:10:49]

Add a comment along the lines of "this code gets called a lot and is debugged
rarely, so it should be fast by default" and point to the bug in the comment

           },
           'conditions': [
             # TODO(phajdan.jr): Also enable on Windows.
             ['disable_debugallocation==0 and OS!="win"', {
               'defines': [
                 # Use debugallocation for Debug builds to catch problems early
                 # and cleanly, http://crbug.com/30715 .
                 'TCMALLOC_FOR_DEBUGALLOCATION',
               ],
             }],
@@ skipping 298 matching lines @@
           'sources': [
             'type_profiler_map_unittest.cc',
             '<(tcmalloc_dir)/src/gperftools/type_profiler_map.h',
             '<(tcmalloc_dir)/src/type_profiler_map.cc',
           ],
         },
       ],
     }],
   ],
 }