[llvm] [AArch64][SDAG] Fix selection of extend of v1if16 SETCC (PR #140274)

[Benjamin Maxwell via llvm-commits]

MacDue wrote:

> Thanks for looking into this, I didn't get too far when looking into it before. Should it be scalarizing somewhere along the line? I would expect that to produce better codegen.

It seems like this was deliberately back in https://reviews.llvm.org/D4322 (apparently to avoid some legalization issues).


https://github.com/llvm/llvm-project/pull/140274