OClCollMeshEngn:*KernelComplete: use WRITE_INVLDT during finalize()

Doing it this way enables us to get the mapBuffer() call working
during finalize. But we couldn't get the unmap call working. That
has to do with a bug in the Rusticl event waiting code.

stimBuffApis/livoxGen1/openClCollatingAndMeshingEngine.cpp

@@ -711,16 +711,21 @@ bool OpenClCollatingAndMeshingEngine::stop()
 	return wasAcceptingRequests;
 }
 
-void OpenClCollatingAndMeshingEngine::compactKernelComplete()
+void OpenClCollatingAndMeshingEngine::compactKernelComplete(bool isFinalizing)
 {
+	cl_map_flags mapFlags;
+
 	/**	EXPLANATION:
 	 * Technically we should only need to do this if we plan to read the
 	 * compacted slots for debugging purposes. Otherwise this is unnecessary.
 	 */
-	mapAssemblyBuffer(CL_MAP_READ);
+
+	if (isFinalizing) { mapFlags = CL_MAP_WRITE_INVALIDATE_REGION; }
+	else { mapFlags = CL_MAP_READ; }
+
+	mapAssemblyBuffer(mapFlags);
 	unmapAssemblyBuffer();
 	clFlush(commandQueue);
-	clFinish(commandQueue);
 
 	// Stop only compact kernel
 	if (compactIsRunning && currentCompactKernelEvent)
@@ -729,20 +734,26 @@ void OpenClCollatingAndMeshingEngine::compactKernelComplete()
 		clReleaseEvent(currentCompactKernelEvent);
 		currentCompactKernelEvent = nullptr;
 	}
+
+	clFinish(commandQueue);
 	compactKernelCb = [](cl_int){};
 	compactIsRunning = false;
 }
 
-void OpenClCollatingAndMeshingEngine::collateKernelComplete()
+void OpenClCollatingAndMeshingEngine::collateKernelComplete(bool isFinalizing)
 {
+	cl_map_flags mapFlags;
 	/**	EXPLANATION:
 	 * Technically we should only need to do this if we plan to read the
 	 * collated dgrams for debugging purposes. Otherwise this is unnecessary.
 	 */
-	mapCollationBuffer(CL_MAP_READ);
+	if (isFinalizing) { mapFlags = CL_MAP_WRITE_INVALIDATE_REGION; }
+	else { mapFlags = CL_MAP_READ; }
+
+	mapCollationBuffer(mapFlags);
 	unmapCollationBuffer();
 	clFlush(commandQueue);
-	clFinish(commandQueue);
+
 	// Stop only collate kernel
 	if (collateIsRunning && currentCollateKernelEvent)
 	{
@@ -750,6 +761,8 @@ void OpenClCollatingAndMeshingEngine::collateKernelComplete()
 		clReleaseEvent(currentCollateKernelEvent);
 		currentCollateKernelEvent = nullptr;
 	}
+
+	clFinish(commandQueue);
 	collateKernelCb = [](cl_int){};
 	collateIsRunning = false;
 }