Summary: The Clang option was previously not included in the User's Manual.

Reviewers: anemet, davidxl, hfinkel

Reviewed By: hfinkel

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D34928

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@307193 91177308-0d34-0410-b5e6-96231b3b80d8