Sanjay Patel 93e64dd9a1 [PatternMatch] allow undef elements when matching vector FP +0.0 ...

This continues the FP constant pattern matching improvements from:
https://reviews.llvm.org/rL327627
https://reviews.llvm.org/rL327339
https://reviews.llvm.org/rL327307

Several integer constant matchers also have this ability. I'm
separating matching of integer/pointer null from FP positive zero
and renaming/commenting to make the functionality clearer.

llvm-svn: 328461

2018-03-25 21:16:33 +00:00

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