ARM: Changed the handling of compiletime CPU feature detection

tools/gyp/v8.gyp

 # Copyright 2011 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 14 matching lines @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 {
   'variables': {
     'use_system_v8%': 0,
     'msvs_use_common_release': 0,
     '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',
   },
   'conditions': [
     ['use_system_v8==0', {
       'target_defaults': {
         'defines': [
           'ENABLE_LOGGING_AND_PROFILING',
           'ENABLE_DEBUGGER_SUPPORT',
           'ENABLE_VMSTATE_TRACKING',
           'V8_FAST_TLS',
         ],
         'conditions': [
           ['OS!="mac"', {
             # TODO(mark): The OS!="mac" conditional is temporary. It can be
             # removed once the Mac Chromium build stops setting target_arch to
             # ia32 and instead sets it to mac. Other checks in this file for
             # OS=="mac" can be removed at that time as well. This can be cleaned
             # up once http://crbug.com/44205 is fixed.
             'conditions': [
               ['v8_target_arch=="arm"', {
                 'defines': [
                   'V8_TARGET_ARCH_ARM',
                 ],
+                'conditions': [
+                  [ 'v8_can_use_vfp_instructions=="true"', {
+                    'defines': [
+                      'CAN_USE_VFP_INSTRUCTIONS',
+                    ],
+                  }],
+                ],
               }],
               ['v8_target_arch=="ia32"', {
                 'defines': [
                   'V8_TARGET_ARCH_IA32',
                 ],
               }],
               ['v8_target_arch=="x64"', {
                 'defines': [
                   'V8_TARGET_ARCH_X64',
                 ],
@@ skipping 772 matching lines @@
           'target_name': 'v8_shell',
           'type': 'none',
           'dependencies': [
             'v8'
           ],
         },
       ],
     }],
   ],
 }