[cfe-commits] PATCH: Adds -Wenum-compare to Clang

[Chandler Carruth]

This patch implements most of -Wenum-compare in Clang. I know of at least on
difference between this implementation and GCC: this is currently on by
default for all languages. In GCC -Wenum-compare is only turned on with
-Wall in C/ObjC, but is on by default in C++. I'm happy either leaving as is
(and it always being on by default) or if someone has a suggestion for how
to model GCC's behavior I'm happy to do that. There may be other differences
in the nature of the implementation, I'm not familiar with GCC's.
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