llvm-project

4ec89085 - AMDGPU: Try to constrain av registers to VGPR to enable ds_write2 formation (#156400)

AMDGPU: Try to constrain av registers to VGPR to enable ds_write2 formation (#156400) In future changes we will have more AV_ virtual registers, which currently block the formation of write2. Most of the time these registers can simply be constrained to VGPR, so do that. Also relaxes the constraint in flat merging case. We already have the necessary code to insert copies to the original result registers, so there's no point in avoiding it. Addresses the easy half of #155769