Fix missing C++ mode comment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194339 91177308-0d34-0410-b5e6-96231b3b80d8
Make method static

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194340 91177308-0d34-0410-b5e6-96231b3b80d8