[llvm] [AMDGPU] Consider FLAT instructions for VMEM hazard detection (PR #137170)

[Jay Foad via llvm-commits]

jayfoad wrote:

> Is this still needed / useful?

To answer that properly you would need to do some archaeology on the original GFX10 hardware hazard (internal ref DEGGIGXX0-8925). But at this point it may not be worth doing the work. Your fix certainly looks safe, in that at worst it will apply the fix in more cases, which should be harmless. Or we could do nothing, since no-one has reported a problem. I don't mind either way.

https://github.com/llvm/llvm-project/pull/137170