Fix a stupid typo in the Dr. Memory runner script

tools/valgrind/valgrind_test.py

 #!/usr/bin/python
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # valgrind_test.py
 
 """Runs an exe through Valgrind and puts the intermediate files in a
 directory.
 """
@@ skipping 715 matching lines @@
 
   def ToolCommand(self):
     """Get the tool command to run."""
     tool_name = self.ToolName()
 
     # WINHEAP is what Dr. Memory supports as there are issues w/ both
     # jemalloc (http://code.google.com/p/drmemory/issues/detail?id=320) and
     # tcmalloc (http://code.google.com/p/drmemory/issues/detail?id=314)
     add_env = {
       "CHROME_ALLOCATOR" : "WINHEAP",
-      "JSIMD_FORCEMMX"   : "0",  # http://code.google.com/p/drmemory/issues/detail?id=540
+      "JSIMD_FORCEMMX"   : "1",  # http://code.google.com/p/drmemory/issues/detail?id=540
     }
     for k,v in add_env.iteritems():
       logging.info("export %s=%s", k, v)
       os.putenv(k, v)
 
     drmem_cmd = os.getenv("DRMEMORY_COMMAND")
     if not drmem_cmd:
       raise RuntimeError, "Please set DRMEMORY_COMMAND environment variable " \
                           "with the path to drmemory.exe"
     proc = drmem_cmd.split(" ")
@@ skipping 224 matching lines @@
       platform_name = sys.platform + "(Unknown)"
     raise RuntimeError, "Unknown tool (tool=%s, platform=%s)" % (tool_name,
                                                                  platform_name)
 
 def CreateTool(tool):
   return ToolFactory().Create(tool)
 
 if __name__ == '__main__':
   logging.error(sys.argv[0] + " can not be run from command line")
   sys.exit(1)