Fixes problem with nosse[234] tests (or anything else that would pass an
unexpected extra parameter on the preparser test command line).

Review URL: http://codereview.chromium.org/6965008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7814 ce2b1a6d-e550-0410-aec6-3dcde31c8c00