adding tracer flush/unload stage unloading

Change-Id: Id84774b2ce20b261a9a84d2ad802b76093a748d4

src/core/roctracer.cpp

@@ -1283,11 +1283,16 @@ PUBLIC_API void roctracer_unload() {
     roctracer::act_journal = NULL;
   }
 
-  roctracer::trace_buffer.Flush();
   roctracer::close_output_file(roctracer::kernel_file_handle);
   ONLOAD_TRACE_END();
 }
 
+PUBLIC_API void roctracer_flush_buf() {
+  ONLOAD_TRACE_BEG();
+  roctracer::trace_buffer.Flush();
+  ONLOAD_TRACE_END();
+}
+
 CONSTRUCTOR_API void constructor() {
   ONLOAD_TRACE_BEG();
   roctracer::util::Logger::Create();