AMDGPU: Try to reuse dest reg for s_add_i32 frame indexes (#111201) Hack around the register scavenger doing the wrong thing. It does not find the result register as available in the case the frame index add isn't also reading the dest register. This is the quick fix for a regression where the scavenge would create a broken spill of SGPR to memory. I believe this is still broken for cases we cannot use the result register. I'm confused about what position the scavenger iterator is supposed to be in, and what RestoreAfter is for. The scavenger is missing a full set of forward/backward APIs and there seems to be an off by one somewhere.
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