AMDGPU: Always use AV spill pseudos on targets with AGPRs (#149099) This increases allocator freedom to inflate register classes to the AV class, we don't need to introduce a new restriction by basing the opcode on the current virtual register class. Ideally we would avoid this if we don't have any allocatable AGPRs for the function, but it probably doesn't make much difference in the end result if they are excluded from the final allocation order.
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