[AMDGPU] Use WriteSALUDummy for v_mad_u64_u32 (#191500) Updates the the new Write*Dummy HWWriteRes to maintain latency -- this is to ensure SchedModel->computeOperandLatency calls are unchanged. This also uses the new HWWriteRes for v_mad_u64_u32 and v_mad_i64_i32. For an explanation of why we want to do this , see https://github.com/llvm/llvm-project/pull/190095 . In short, the scheduler will not try to cover the full latency of the instructions without this new modelling. This causes a good amount of lit churn since these instructions are well covered.
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