[AMDGPU][GFX1250] Insert S_WAIT_XCNT for SMEM and VMEM load-stores (#145566) This patch tracks the register operands of both VMEM (FLAT, MUBUF, MTBUF) and SMEM load-store operations and inserts a S_WAIT_XCNT instruction with sufficient wait-count before potentially redefining them. For VMEM instructions, XNACK is returned in the same order as they were issued and hence non-zero counter values can be inserted. However, SMEM execution is out-of-order and so is their XNACK reception. Thus, only zero counter value can be inserted to capture SMEM dependencies.
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