Revert "Port alltoall[v]" (#325)

This reverts commit 2c49121171.

[ROCm/rccl commit: 8e180cf087]

projects/rccl/src/include/info.h

@@ -20,8 +20,7 @@ typedef enum {
   ncclPatternTreeDown,
   ncclPatternTreeUpDown,
   ncclPatternCollTreeUp,
-  ncclPatternCollTreeDown,
-  ncclPatternAll
+  ncclPatternCollTreeDown
 } ncclPattern_t;
 
 // Used to pass NCCL call information between functions
@@ -40,11 +39,6 @@ struct ncclInfo {
   // Algorithm details
   int chunkSteps;
   int sliceSteps;
-  // For alltoallv
-  const size_t *sendcounts;
-  const size_t *sdispls;
-  const size_t *recvcounts;
-  const size_t *rdispls;
   // Computed later
   int algorithm;
   int protocol;