move Release build to -O3 (from -O2)

git-svn-id: http://skia.googlecode.com/svn/trunk@3988 2bbb7eff-a529-9590-31e7-b0007b416f81

gyp/common_conditions.gypi

@@ -86,7 +86,7 @@
             'cflags': ['-g']
           },
           'Release': {
-            'cflags': ['-O2'],
+            'cflags': ['-O3'],
             'defines': [ 'NDEBUG' ],
           },
         },