[esnext] prototype runtime implementation for async functions

src/v8.gyp

 # 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 2008 matching lines @@
           'js/macros.py',
           'messages.h',
           'js/harmony-atomics.js',
           'js/harmony-regexp-exec.js',
           'js/harmony-sharedarraybuffer.js',
           'js/harmony-simd.js',
           'js/harmony-species.js',
           'js/harmony-unicode-regexps.js',
           'js/harmony-string-padding.js',
           'js/promise-extra.js',
+          'js/harmony-async-await.js'
         ],
         'libraries_bin_file': '<(SHARED_INTERMEDIATE_DIR)/libraries.bin',
         'libraries_experimental_bin_file': '<(SHARED_INTERMEDIATE_DIR)/libraries-experimental.bin',
         'libraries_extras_bin_file': '<(SHARED_INTERMEDIATE_DIR)/libraries-extras.bin',
         'libraries_experimental_extras_bin_file': '<(SHARED_INTERMEDIATE_DIR)/libraries-experimental-extras.bin',
       },
       'actions': [
         {
           'action_name': 'js2c',
           'inputs': [
@@ skipping 177 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }