[llvm] [X86] Prefer andl to andb to save one byte encoding when using with bzhi or bextr (PR #86921)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

@phoebewang Sorry for pinging such an old issue, but afaict you confirmed that there isn't a general case for this and its only beneficial as a BZHI/BEXTR fold correct?

https://github.com/llvm/llvm-project/pull/86921