[llvm] [AMDGPU] Add NV bit to CPol::ALL mask. NFCI. (PR #153487)

[Stanislav Mekhanoshin via llvm-commits]

rampitec wrote:

> I'm surprised this doesn't cause any test changes.

It's mostly used in image lowering, which we do not have here.

https://github.com/llvm/llvm-project/pull/153487