Fix test harness to accept camel-case modes.

tools/run-tests.py

 #!/usr/bin/env python
 #
 # 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
@@ skipping 137 matching lines @@
 def ProcessOptions(options):
   global VARIANT_FLAGS
 
   # Architecture and mode related stuff.
   if options.arch_and_mode:
     tokens = options.arch_and_mode.split(".")
     options.arch = tokens[0]
     options.mode = tokens[1]
   options.mode = options.mode.split(",")
   for mode in options.mode:
-    if not mode in ["debug", "release"]:
+    if not mode.lower() in ["debug", "release"]:
       print "Unknown mode %s" % mode
       return False
   if options.arch in ["auto", "native"]:
     options.arch = ARCH_GUESS
   options.arch = options.arch.split(",")
   for arch in options.arch:
     if not arch in SUPPORTED_ARCHS:
       print "Unknown architecture %s" % arch
       return False
 
@@ skipping 191 matching lines @@
   except KeyboardInterrupt:
     return 1
 
   if options.time:
     verbose.PrintTestDurations(suites, overall_duration)
   return exit_code
 
 
 if __name__ == "__main__":
   sys.exit(Main())