[llvm] [AArch64] Extend condition optimizer to support unsigned comparisons (PR #144380)

[via llvm-commits]

AZero13 wrote:

> These are literally just copy pastes of the old tests but modified to work with unsigned and mixed versions @davemgreen
> 
> There's nothing that complex about it.

To prevent the conditions from being condensed to a conditional compare, it needs to be complex to ensure these conditions are implemented as branches in the asm.

https://github.com/llvm/llvm-project/pull/144380