SWDEV-240806 - Added API hipLaunchHostFunc and updated graph test for host graph node (#2512)

Change-Id: Idf759064946e503a2b3cc2a38f1a7cb049012688

include/hip/hip_runtime_api.h

@@ -4401,6 +4401,19 @@ hipError_t hipStreamUpdateCaptureDependencies(hipStream_t stream, hipGraphNode_t
                                               size_t numDependencies,
                                               unsigned int flags __dparm(0));
 
+/**
+ * @brief Enqueues a host function call in a stream.
+ *
+ * @param [in] stream - stream to enqueue work to.
+ * @param [in] fn - function to call once operations enqueued preceeding are complete.
+ * @param [in] userData - User-specified data to be passed to the function.
+ * @returns #hipSuccess, #hipErrorInvalidResourceHandle, #hipErrorInvalidValue,
+ * #hipErrorNotSupported
+ * @warning : This API is marked as beta, meaning, while this is feature complete,
+ * it is still open to changes and may have outstanding issues.
+ */
+hipError_t hipLaunchHostFunc(hipStream_t stream, hipHostFn_t fn, void* userData);
+
 /**
  * @brief Swaps the stream capture mode of a thread.
  *