[llvm] [AMDGPU] Split wide constant address space stores (PR #226069)

[Shilei Tian via llvm-commits]

shiltian wrote:

I'd prefer to treat it as deleting the instruction rather than handling it the same way as a global store, similar to how the compiler treats other UB in the code.

https://github.com/llvm/llvm-project/pull/226069