Refactor .gyp files:

tools/test-wrapper-gypbuild.py

 #!/usr/bin/env python
 #
 # 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
@@ skipping 195 matching lines @@
   args_for_children += ['--no-build', '--build-system=gyp']
   for arg in args:
     args_for_children += [arg]
   returncodes = 0
 
   for mode in options.mode:
     for arch in options.arch:
       print ">>> running tests for %s.%s" % (arch, mode)
       shell = workspace + '/' + options.outdir + '/' + arch + '.' + mode + "/d8"
       child = subprocess.Popen(' '.join(args_for_children +
+                                        ['--arch=' + arch] +
                                         ['--mode=' + mode] +
                                         ['--shell=' + shell]),
                                shell=True,
                                cwd=workspace)
       returncodes += child.wait()
 
   return returncodes
 
 
 if __name__ == '__main__':
   sys.exit(Main())