A64: Add Android_a64 build target

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 446 matching lines @@
                 'cflags': [ '<(m32flag)' ],
                 'ldflags': [ '<(m32flag)' ],
               }],
             ],
             'xcode_settings': {
               'ARCHS': [ 'i386' ],
             },
           }],
         ],
       }],
-      ['(OS=="linux") and (v8_target_arch=="x64")', {
+      ['(OS=="linux" or OS=="android") and \
+        (v8_target_arch=="x64" or v8_target_arch=="a64")', {
         # Check whether the host compiler and target compiler support the
         # '-m64' option and set it if so.
         'target_conditions': [
           ['_toolset=="host"', {
             'variables': {
               'm64flag': '<!((echo | $(echo ${CXX_host:-$(which g++)}) -m64 -E - > /dev/null 2>&1) && echo "-m64" || true)',
             },
             'cflags': [ '<(m64flag)' ],
             'ldflags': [ '<(m64flag)' ],
           }],
@@ skipping 164 matching lines @@
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }