Diana Picus 2004ab422a MachineIRBuilder: Add buildMergeValues. NFC ...

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

I haven't audited all the uses of `buildMergeLikeInstr` 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

Differential Revision: https://reviews.llvm.org/D141373

2023-01-13 09:32:58 +01:00

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