Add Pivot AllToAll algorithm for Rome model (#503)

* add a2a pivot interface

* remove debug info

* address comments

* fix bug

* remove custom script

* address comments

* fix bug

[ROCm/rccl commit: b569c0a1db]

projects/rccl/tools/topo_expl/utils.cpp

@@ -31,7 +31,7 @@
 #include "utils.h"
 #include "rocm_smi/rocm_smi.h"
 
-const char* ncclFuncStr[NCCL_NUM_FUNCTIONS+1] = { "Broadcast", "Reduce", "AllGather", "ReduceScatter", "AllReduce", "SendRecv" };
+const char* ncclFuncStr[NCCL_NUM_FUNCTIONS+2] = { "Broadcast", "Reduce", "AllGather", "ReduceScatter", "AllReduce", "SendRecv", "AllToAllPivot" };
 const char* ncclAlgoStr[NCCL_NUM_ALGORITHMS] = { "Tree", "Ring", "CollNet" };
 const char* ncclProtoStr[NCCL_NUM_PROTOCOLS] = { "LL", "LL128", "Simple" };