Fix data race in cctest/test-api/RegExpInterruption

BUG=v8:3615
R=yangguo@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/634523003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24451 ce2b1a6d-e550-0410-aec6-3dcde31c8c00