[llvm] [AArch64] Allow peephole to optimize AND + signed compare with 0 (PR #153608)

[via llvm-commits]

AZero13 wrote:

> I think the utility of your change would be more apparent if you pre-comitted some tests. IIUC this is folding things like:
> 
> ```
> 
>         and     w8, w9, w8
> 
>         cmp     w8, #0
> 
> ```
> 
> to
> 
> ```
> 
> tst w9, w8
> 
> ```
> 
> ?

Yes exactly that's the point 

https://github.com/llvm/llvm-project/pull/153608