Add support for hipExtStreamGetCUMask API

Change-Id: I0fa67ad581dd75556f17c7410af2c1d5cb6ae99a

include/hip/hcc_detail/hip_runtime_api.h

@@ -1196,6 +1196,20 @@ hipError_t hipStreamGetPriority(hipStream_t stream, int* priority);
 hipError_t hipExtStreamCreateWithCUMask(hipStream_t* stream, uint32_t cuMaskSize, const uint32_t* cuMask);
 
 
+/**
+ * @brief Get CU mask associated with an asynchronous stream
+ *
+ * @param[in] stream stream to be queried
+ * @param[in] cuMaskSize number of the block of memories (uint32_t *) allocated by user
+ * @param[out] cuMask Pointer to a pre-allocated block of memories (uint32_t *) in which
+ * the stream's CU mask is returned. The CU mask is returned in a chunck of 32 bits where
+ * each active bit represents one active CU
+ * @return #hipSuccess, #hipErrorInvalidHandle, #hipErrorInvalidValue
+ *
+ * @see hipStreamCreate, hipStreamSynchronize, hipStreamWaitEvent, hipStreamDestroy
+ */
+hipError_t hipExtStreamGetCUMask(hipStream_t stream, uint32_t cuMaskSize, uint32_t* cuMask);
+
 /**
  * Stream CallBack struct
  */