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

[via llvm-commits]

gonzalobg wrote:

This extension looks good to me and it can be useful in a few places.
Looking forward to see how it ends up being used.

I hope we watch out for and resist the temptation to use it to reify backend bugs as programming model "features", i.e., instead of declaring that some backend not supporting some op to some statespace is a backend bug, we end up declaring that performing that op to that statespace is UB in the programming model, and end up using this feature to encode that.

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