snapshot creation in a better way.

Encode whether or not the stub should use sse3 instructions in the
minor key of the stub.  The stubs generated during snapshot creation
will have sse3 disabled, but they will not be found when sse3 is
enabled.  Therefore they will only affect the code generated as part
of the snapshot.
Review URL: http://codereview.chromium.org/172086

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2705 ce2b1a6d-e550-0410-aec6-3dcde31c8c00