Make sure GCMole pukes when Clang invocation fails.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/16878003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15187 ce2b1a6d-e550-0410-aec6-3dcde31c8c00