[llvm] [AMDGPU] gfx1250 has fixed GETPC bug and also extended VA to 57 bits (PR #152373)

[Stanislav Mekhanoshin via llvm-commits]

rampitec wrote:

> Hmm, no test for this?

Yeah, we do not seem to have any. It probably can be forged out the original gfx12 tests where this w/a was introduced.

https://github.com/llvm/llvm-project/pull/152373