[llvm] [AMDGPU] Remove alignment constraint from spill pseudos (PR #177317)

[via llvm-commits]

easyonaadit wrote:

> > Update the machine verifier accordingly.
> 
> Remove this from the description?

I still need to update the verifier to stop checking alignment for spill pseudos. 

https://github.com/llvm/llvm-project/pull/177317