[Sema] Fix SemaDiagnosticBuilder to be inline.
 - As with DiagnosticBuilder, it is very important that SemaDiagnosticBuilder be
   completely inline to ensure that the compiler can rip it apart and sink it to
   registers.

This is good for another 30k reduction in code size.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152708 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed