[llvm] AMDGPU: Add disjoint to or produced from lowering vector ops (PR #122424)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> surprised that no test change is needed

It's not surprising, this rarely does anything. The only times it's really useful is when the or appears in an addressing expression, which won't really appear as a user of a vector expansion 

https://github.com/llvm/llvm-project/pull/122424