[PATCH] CodeGen: Emit warnings when dropping profile data during PGO

[Justin Bogner]

This adds a warning that triggers when profile data doesn't match for
the source that's being compiled with -fprofile-instr-use=. This fires
only once per translation unit, as warning on every mismatched function
would be quite noisy.

The warning is added to DiagnosticSemaKinds because several other
warnings in IRGen seem to live there and there is no
DiagnosticCodeGenKinds. If there's a more appropriate place, please let
me know.

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