[PATCH] D141373: MachineIRBuilder: Add buildMergeValues. NFC

[Diana Picus via Phabricator via llvm-commits]

rovka created this revision.
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Add a `buildMergeValues` method that unconditionally builds a
G_MERGE_VALUES instruction, as opposed to `buildMergeLikeOp` which may
decide on a different opcode based on the input types.

I haven't audited all the uses of `buildMergeLikeOp` to see if they can
be replaced with `buildMergeValues`, but I did find a couple of obvious
ones where we check that we're merging scalars right before calling
`buildMerge`.

This is a follow-up suggested in https://reviews.llvm.org/D140964


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141373

Files:
  llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h
  llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
  llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
  llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
  llvm/unittests/CodeGen/GlobalISel/MachineIRBuilderTest.cpp

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