[PATCH] D135415: [GlobalISel] Make comparison matcher commutative for commutative predicates

[Jessica Paquette via Phabricator via llvm-commits]

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This allows us to automate pattern-matching for things like:

- (x == y) == (y == x)
- (x != y) == (y != x)

This came up as a potential simplification for D135380 <https://reviews.llvm.org/D135380>.

In order to do this, we need to be able to check if a predicate is commutative without having access to a CmpInst. Add static functions similar to `isEquality` to achieve this.


https://reviews.llvm.org/D135415

Files:
  llvm/include/llvm/CodeGen/GlobalISel/MIPatternMatch.h
  llvm/include/llvm/IR/InstrTypes.h
  llvm/include/llvm/IR/Instructions.h
  llvm/lib/IR/Instructions.cpp
  llvm/unittests/CodeGen/GlobalISel/PatternMatchTest.cpp

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