[clang] Remove double semicolons. NFC.

Reviewers: rsmith, craig.topper, efriedma

Reviewed By: efriedma

Subscribers: efriedma, cfe-commits

Tags: #clang-c

Differential Revision: https://reviews.llvm.org/D33926

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@304823 91177308-0d34-0410-b5e6-96231b3b80d8