Change cctests to use variant flags as part of the name for the serilization file.

Change cctests to use variant flags as part of the name for the serilization file.

Because we run all tests three times with different variant flags (to
test crankshaft) we might end up in a situation where we try to write
to the same serilization file from two different threads
simultaneously. The patch concats the variant flags at the end of the
serialization file name.
Committed: http://code.google.com/p/v8/source/detail?r=7285

[Erik Corry, 2011-03-21 12:44:41]

LGTM