[llvm] [X86] combineINSERT_SUBVECTOR - fold insert_subvector(base,extract_subvector(broadcast)) -> blend shuffle(base,broadcast) (PR #133083)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

If you have the full IR, are you able to use bugpoint with a large timeout value (and a bit of patience!)?

https://github.com/llvm/llvm-project/pull/133083