[llvm] [X86] getScalarMaskingNode - FIXUPIMM scalar ops take upper elements from second operand (PR #179101)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

> If 21.x is still open to fixes, a backport there would also be appreciated.

I'm sorry but 21.x won't be getting any more fixes, but this hopefully will get merged into 22.x

https://github.com/llvm/llvm-project/pull/179101