Fixes to all tests that divide buffers by nranks so that they trim buffer sizes to be multiples of 16 bytes.

This ensures non-pow2 ranks have buffer addresses aligned suitably for performance.

src/common.cu

@@ -571,7 +571,7 @@ void setupArgs(size_t size, ncclDataType_t type, struct threadArgs* args) {
   size_t count, sendCount, recvCount, paramCount, sendInplaceOffset, recvInplaceOffset;
 
   count = size / wordSize(type);
-  args->collTest->getCollByteCount(&sendCount, &recvCount, &paramCount, &sendInplaceOffset, &recvInplaceOffset, (size_t)count, (size_t)nranks);
+  args->collTest->getCollByteCount(&sendCount, &recvCount, &paramCount, &sendInplaceOffset, &recvInplaceOffset, (size_t)count, wordSize(type), (size_t)nranks);
 
   args->nbytes = paramCount * wordSize(type);
   args->sendBytes = sendCount * wordSize(type);