make bvh kernel work on AMD GPU (and reported an OpenCL compiler bug)

enable source-level OpenCL debugging of a single kernel

demo/gpudemo/main_opengl3core.cpp

@@ -359,6 +359,8 @@ const char* g_deviceName = "blaat";
 
 int main(int argc, char* argv[])
 {
+	
+
     printf("main start");
 
 	CommandLineArgs args(argc,argv);