[llvm] [VectorCombine] New folding pattern for extract/binop/shuffle chains (PR #145232)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

Sorry I haven't had a recent chance to look at this - got a few comments, will get back to it later today.

https://github.com/llvm/llvm-project/pull/145232