Experimental change to omit frame pointers from V8 on Mac

built through the v8.gyp file. The optimization flags for
Mac and Linux (both gcc-based) builds are now much closer.
Review URL: http://codereview.chromium.org/173117

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2731 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/gyp/v8.gyp

@@ -104,6 +104,7 @@
 	  ['OS=="mac"', {
 	    'xcode_settings': {
 	      'GCC_OPTIMIZATION_LEVEL': '3',
+	      'OTHER_CFLAGS': [ '-fomit-frame-pointer' ],
 	    },
 	  }],
           ['OS=="win"', {