Define CAN_USE_ARMV7_INSTRUCTIONS if armv7 gyp flag is set.

build/common.gypi

 # Copyright 2012 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 116 matching lines @@
         'defines': ['VERIFY_HEAP',],
       }],
       ['v8_interpreted_regexp==1', {
         'defines': ['V8_INTERPRETED_REGEXP',],
       }],
       ['v8_target_arch=="arm"', {
         'defines': [
           'V8_TARGET_ARCH_ARM',
         ],
         'conditions': [
+          ['armv7==1', {
+            'defines': [
+              'CAN_USE_ARMV7_INSTRUCTIONS=1',
+            ],
+          }],
           [ 'v8_can_use_unaligned_accesses=="true"', {
             'defines': [
               'CAN_USE_UNALIGNED_ACCESSES=1',
             ],
           }],
           [ 'v8_can_use_unaligned_accesses=="false"', {
             'defines': [
               'CAN_USE_UNALIGNED_ACCESSES=0',
             ],
           }],
@@ skipping 285 matching lines @@
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }