Update comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196430 91177308-0d34-0410-b5e6-96231b3b80d8
Update comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196431 91177308-0d34-0410-b5e6-96231b3b80d8