Fix missing C++ mode comment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218654 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Fix broken check lines, missing scalar case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218655 91177308-0d34-0410-b5e6-96231b3b80d8