[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:

@alinas if you don't have the code repro yet, do you have the command line - target + -march -mcpu -Olevel in particular?

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