[llvm] [RFC] IR: Define noalias.addrspace metadata (PR #102461)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Yes, it is only true for the pre sm_70 CUDA `__atomicXXX` builtins, but not true for the post sm_70 and newer CUDA atomics APIs (`cuda::atomic`, `cuda::atomic_ref`) from the `<cuda/atomic>` header in the CUDA Toolkit.

Ugh, that means we probably also need to create something like #102569 to implement these then 

https://github.com/llvm/llvm-project/pull/102461