[llvm] [GlobalIsel] Transform build_vector(binop(_, C), ...) -> binop(bv, constant bv) (PR #73577)

[Amara Emerson via llvm-commits]

https://github.com/aemerson commented:

Can you pre-commit the re-generated checks for inline-memset.mir so we can see the difference

https://github.com/llvm/llvm-project/pull/73577