[llvm] [VectorCombine] Fold permute of intrinsics into intrinsic of permutes: shuffle(intrinsic, poison/undef) -> intrinsic(shuffle) (PR #170052)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

@kuroyukiasuna you will need to regenerate the VectorCombine/X86/shuffle-of-fma-const.ll  test I added this morning for #170465

https://github.com/llvm/llvm-project/pull/170052