Disable frame pointers

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 119 matching lines @@
           '-march=mips32',
           '-mhard-float',
           '-fno-strict-overflow',
         ],
       },
 
       'Dart_Linux_Debug': {
         'abstract': 1,
         'cflags': [
           '-O<(dart_debug_optimization_level)',
-          # The sampling profiler uses the frame pointer to walk the stack.
-          '-fno-omit-frame-pointer',
+          # Uncomment the following line and pass --profile-vm to enable
+          # profiling of C++ code within Observatory.
+          # '-fno-omit-frame-pointer',
           # Clang on Linux will still omit frame pointers from leaf functions
           # unless told otherwise:
           # '-mno-omit-leaf-frame-pointer',
         ],
       },
 
       'Dart_Linux_Release': {
         'abstract': 1,
         'cflags': [
           '-O3',
-          # The sampling profiler uses the frame pointer to walk the stack.
-          '-fno-omit-frame-pointer',
+          # Uncomment the following line and pass --profile-vm to enable
+          # profiling of C++ code within Observatory.
+          # '-fno-omit-frame-pointer',
           # Clang on Linux will still omit frame pointers from leaf functions
           # unless told otherwise:
           # '-mno-omit-leaf-frame-pointer',
         ],
       },
     },
   },
 }