Add MSCCL Support (#658)

* Add MSCCL support

* Add alignment and message size checking

* Fix nRanks checking, in-place and out-of-place tests and group call handling

* Fix hipGraph unit test

* Change MSCCL init warning to INFO

* Revise license info

[ROCm/rccl commit: adafc0f759]

projects/rccl/src/include/group.h

@@ -1,5 +1,6 @@
 /*************************************************************************
  * Copyright (c) 2015-2017, NVIDIA CORPORATION. All rights reserved.
+ * Modifications Copyright (c) Microsoft Corporation. Licensed under the MIT License.
  *
  * See LICENSE.txt for license information
  ************************************************************************/
@@ -67,11 +68,6 @@ extern __thread struct ncclComm* ncclGroupCommHead;
 extern __thread struct ncclComm* ncclGroupCommPreconnectHead;
 extern __thread int ncclGroupBlocking;
 
-inline ncclResult_t ncclGroupStartInternal() {
-  ncclGroupDepth++;
-  return ncclSuccess;
-}
-
 inline ncclResult_t ncclGroupErrCheck(ncclResult_t ret) {
   if (ncclGroupDepth > 0) {
     if (ret != ncclSuccess && ret != ncclInProgress) ncclGroupError = ret;