Added async memcpy driver api for nvcc backend

Change-Id: If401fc949b834c883cff9de74adb0d532a0fd942


[ROCm/clr commit: bbead42cb0]

projects/clr/hipamd/include/nvcc_detail/hip_runtime_api.h

@@ -232,6 +232,24 @@ inline static hipError_t hipMemcpyDtoD(hipDeviceptr_t dst,
     return hipCUResultTohipError(cuMemcpyDtoD(dst, src, size));
 }
 
+inline static hipError_t hipMemcpyHtoDAsync(hipDeviceptr_t dst, 
+                  void* src, size_t size, hipStream_t stream)
+{
+    return hipCUResultTohipError(cuMemcpyHtoDAsync(dst, src, size, stream));
+}
+
+inline static hipError_t hipMemcpyDtoHAsync(void* dst, 
+                  hipDeviceptr_t src, size_t size, hipStream_t stream)
+{
+    return hipCUResultTohipError(cuMemcpyDtoH(dst, src, size, stream));
+}
+
+inline static hipError_t hipMemcpyDtoDAsync(hipDeviceptr_t dst,
+            hipDeviceptr_t src, size_t size, hipStream_t stream)
+{
+    return hipCUResultTohipError(cuMemcpyDtoD(dst, src, size, stream));
+}
+
 inline static hipError_t hipMemcpy(void* dst, const void* src, size_t sizeBytes, hipMemcpyKind copyKind) {
   return hipCUDAErrorTohipError(cudaMemcpy(dst, src, sizeBytes, hipMemcpyKindToCudaMemcpyKind(copyKind)));
 }