ARM: Changed the handling of compiletime CPU feature detection

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
diff --git a/tools/gyp/v8.gyp b/tools/gyp/v8.gyp
index 77f13faa123b4930f371b15ffb52afce98416718..d266e87d3080dcc7dfae1d25021319f4200caa78 100644
--- a/tools/gyp/v8.gyp
+++ b/tools/gyp/v8.gyp
@@ -32,6 +32,7 @@
     'gcc_version%': 'unknown',
     'v8_compress_startup_data%': 'false',
     'v8_target_arch%': '<(target_arch)',
+    'v8_can_use_vfp_instructions%': 'false',
     'v8_use_snapshot%': 'true',
     'v8_use_liveobjectlist%': 'false',
   },
@@ -56,6 +57,13 @@
                 'defines': [
                   'V8_TARGET_ARCH_ARM',
                 ],
+                'conditions': [
+                  [ 'v8_can_use_vfp_instructions=="true"', {
+                    'defines': [
+                      'CAN_USE_VFP_INSTRUCTIONS',
+                    ],
+                  }],
+                ],
               }],
               ['v8_target_arch=="ia32"', {
                 'defines': [