[llvm] [X86] combineINSERT_SUBVECTOR - attempt to widen mask predicate as scalar integer instead of inserting into a zero vXi1 vector (PR #192699)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

Weird - Haswell doesn't have legal vXi1 types, so I'm not sure how its gotten to that new fold at all :/ Looks like I'm going to need a repro please.

https://github.com/llvm/llvm-project/pull/192699