Sema: Improve comment introduced in r193397


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194052 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194054 91177308-0d34-0410-b5e6-96231b3b80d8