[llvm] [AMDGPU] Introduce a pseudo mnemonic for S_DELAY_ALU in MIR. (PR #96004)

[Michael Bedy via llvm-commits]

mjbedy wrote:

> I think this looks pretty nice, unless there are any principled objections to using custom formatted MIR operands?
> 
> Doing a similar thing for `s_waitcnt` would make some of our MIR tests _way_ more readable.

There are a few other literals that I think could benefit as well. 

https://github.com/llvm/llvm-project/pull/96004