[llvm] [AMDGPU] Update base addr of dyn alloca considering GrowingUp stack (PR #119822)

[via llvm-commits]

easyonaadit wrote:

> > > If that's the case why do we need this while selecting the opcode https://github.com/llvm/llvm-project/pull/119822/files#diff-e78d2fbd64648d787707fd3d4e7e5b5d2f00fb9c09972937718a11237933c597R4042
> > 
> > 
> > To make things more complicated than necessary. This should just assert
> 
> @easyonaadit fix it in a separate patch.

yupp I will do that then.

https://github.com/llvm/llvm-project/pull/119822