[llvm] [AMDGPU] Fix GFX1250 hazard: S_SET_VGPR_MSB dropped (PR #184904)

[Stanislav Mekhanoshin via llvm-commits]

rampitec wrote:

To me it is way easier to just mitigate the problem right in the VGPR lowering. The mitigation function does not use anything essential from the hazard recognizer.

https://github.com/llvm/llvm-project/pull/184904