Douglas Gregor fd27fed584 Return early from Sema::MarkDeclarationReferenced when we know there ...

isn't any extra work to perform. Also, don't check for unused
parameters when the warnings will be suppressed anyway. Improves
performance of -fsyntax-only on 403.gcc's combine.c by ~2.5%. 
<rdar://problem/7836787>

llvm-svn: 100686

2010-04-07 20:29:57 +00:00

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