OpenCL checks: Add check for the need to clFlush kernel cmds

compile/clshmemlatency.cpp

@@ -121,7 +121,7 @@ int main() {
 
             // --------------------
             // Run a few iterations
-            for (int iter = 0; iter < 5; ++iter) {
+            for (int iter = 0; iter < 10; ++iter) {
                 cl_event evt;
                 auto t0 = std::chrono::high_resolution_clock::now();