Address comments on c_frame_pointers CL

tools/gyp/configurations_make.gypi

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables': {
     'dart_debug_optimization_level%': '2',
   },
   'target_defaults': {
     'configurations': {
@@ skipping 123 matching lines @@
       },
 
       'Dart_Linux_Debug': {
         'abstract': 1,
         'conditions': [
           ['c_frame_pointers==1', {
             'cflags': [
               '-fno-omit-frame-pointer',
               # Clang on Linux will still omit frame pointers from leaf
               # functions unless told otherwise:
-              # '-mno-omit-leaf-frame-pointer',
+              '-mno-omit-leaf-frame-pointer',
             ],
             'defines': [
               'PROFILE_NATIVE_CODE'
             ],
           }],
         ],
         'cflags': [
           '-O<(dart_debug_optimization_level)',
         ],
       },
 
       'Dart_Linux_Release': {
         'abstract': 1,
         'conditions': [
           ['c_frame_pointers==1', {
             'cflags': [
               '-fno-omit-frame-pointer',
               # Clang on Linux will still omit frame pointers from leaf
               # functions unless told otherwise:
-              # '-mno-omit-leaf-frame-pointer',
+              '-mno-omit-leaf-frame-pointer',
             ],
             'defines': [
               'PROFILE_NATIVE_CODE'
             ],
           }],
         ],
         'cflags': [
           '-O3',
         ],
       },
     },
   },
 }