[Sampling]: add wavefront sampling into MGPUSim. To merge to v3 branch #126
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…s dead lock when (1,2,3) are satisfied. 1) wavefonts in wfpools[next] are complted but not scheduled out; 2)wfpools[next+1].wfs has activate wfs; 3)other wavefronts are completed
Minor changes in formats
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We added the wavefront-level sampling codes, as discussed in Photon[1].
[1].Liu, Changxi, Yifan Sun, and Trevor E. Carlson. "Photon: A fine-grained sampled simulation methodology for GPU workloads." MICRO 2023.