AMDGPU: Handle s_add_u32 in eliminateFrameIndex (#129628) We can fold frame indexes directly into existing immediate operands, just like is already done for s_add_i32. We happen to use s_add_i32 in the 32-bit add case, but s_add_u32 appears in the a 64-bit add sequence of a flat pointer if an addrpacecast source is a frame index. This avoids, but does not address a failure exposed after a3165398db0736588daedb07650195502592e567 where two literal operands end up in the final instruction. The underlying issue still exists for some instructions without special handling in eliminateFrameIndex.
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