[PATCH] D57656: GlobalISel: Fix artifact combiner constant legality checks for vectors

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: aemerson, dsanders, paquette, volkan, aditya_nandakumar.
Herald added subscribers: Petar.Avramovic, kristof.beyls, rovka, nhaehnle, wdng, jvesely.

Since G_CONSTANT is illegal for vectors, this needs to check
what buildConstant will produce for a splat vector.


https://reviews.llvm.org/D57656

Files:
  test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-anyext.mir
  test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-sext.mir
  test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-zext.mir

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