Be more precise when diagnosing 'inline' on global replacement functions


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193061 91177308-0d34-0410-b5e6-96231b3b80d8
Sema: Explain our deviation from the standard by referencing the, now open, LWG issue.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193062 91177308-0d34-0410-b5e6-96231b3b80d8