[clang] also skip blacklisted flags when passed as -flag=arg
[clang] also skip blacklisted flags when passed as -flag=arg

Summary: There's currently no way to skip these when they are passed to clang.

Reviewed By: martintrojer

Differential Revision: D15669132

fbshipit-source-id: be97d2638

jvillard/infer,jvillard/infer,facebook/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer,facebook/infer,jvillard/infer,jvillard/infer,facebook/infer