[llvm] [LLVM][CodeGen][AArch64] while_le(#, max_int) -> all_active (PR #111183)

[Paul Walker via llvm-commits]

paulwalker-arm wrote:

> I'm not familiar enough with the LLVM code here to tell if this is a problem, but this transform is only valid if the NZCV output of WHILELE is unused, right? Otherwise it'd have to fold to PTRUES

We don't expose the "S" instruction variants at this level but instead have a dedicated PTEST ISD node that we later try to combine into an instruction that also sets the flags.

https://github.com/llvm/llvm-project/pull/111183