[llvm] pr/amdgpu closed world (PR #66488)

[Johannes Doerfert via llvm-commits]

jdoerfert wrote:

> > This looks useful - did it make it in some other form?
> 
> No, this is waiting for #83131, which is in turn waiting for some variant of #93526 or #86012

FWIW, it waits for the other PR, then needs an update to use the pass manager intrinsic knowledge of a post-link time world rather than the flag.
The logic itself should be ready to merge though.

https://github.com/llvm/llvm-project/pull/66488