[PATCH] AArch64 Neon Scalar Integer Compare Instructions

[mcrosier at codeaurora.org]

All,
The attached patches contain clang front-end and LLVM back-end code
changes to add support for NEON scalar integer compare instructions.  The
compare instructions are implemented as builtins/intrinsics.  My attempt
at using operators resulted in the code being matched to non-NEON scalar
compare instructions.

I could also add patterns to match IR written without intrinsics, but I
wasn't sure this was beneficial at this time.  Feel free to comment if you
think it would be beneficial to add such patterns and IT tests at a later
time.

Please have a look!

 Chad
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