msccl: fix data corruption with MTYPE_RW (#1014)

[ROCm/rccl commit: 81602814a7]

projects/rccl/src/collectives/device/msccl_kernel_impl.h

@@ -460,7 +460,7 @@ __device__ __forceinline__ void mscclRunInterpreter(
           return;
       }
       if (t->hasDependence && tid == nthreads-1)
-        __atomic_store_n(&mscclFlags[bid].flag, (uint64_t) COMPUTE_FLAG(workIndex, iter, step), __ATOMIC_RELAXED);
+        __atomic_store_n(&mscclFlags[bid].flag, (uint64_t) COMPUTE_FLAG(workIndex, iter, step), t->type == MSCCL_REDUCE ? __ATOMIC_RELEASE : __ATOMIC_RELAXED);
       step++;
     }
   }