llvm-project

2ec7959b - [AMDGPU][SIInsertWaitcnts] Track SCC. Insert KM_CNT waits for SCC writes. (#157843)

[AMDGPU][SIInsertWaitcnts] Track SCC. Insert KM_CNT waits for SCC writes. (#157843) Add new event SCC_WRITE for s_barrier_signal_isfirst and s_barrier_leave, instructions that write to SCC, counter is KM_CNT. Also start tracking SCC for reads and writes. s_barrier_wait on the same barrier guarantees that the SCC write from s_barrier_signal_isfirst has landed, no need to insert s_wait_kmcnt.