[tests] Fix and un-skip mjsunit/es6/array-iterator-turbo

src/runtime/runtime-test.cc

Index: src/runtime/runtime-test.cc
diff --git a/src/runtime/runtime-test.cc b/src/runtime/runtime-test.cc
index 4fe438bf95bf8d93cea38ebd5e08c4b5f338f843..c153137d1aad89671be21132bb9d2dfd2d74da07 100644
--- a/src/runtime/runtime-test.cc
+++ b/src/runtime/runtime-test.cc
@@ -280,6 +280,11 @@ RUNTIME_FUNCTION(Runtime_OptimizeFunctionOnNextCall) {
   if (function->IsOptimized()) return isolate->heap()->undefined_value();
 
   function->MarkForOptimization();
+  if (FLAG_trace_opt) {
+    PrintF("[manually marking ");
+    function->ShortPrint();
+    PrintF(" for optimization]\n");
+  }
 
   if (args.length() == 2) {
     CONVERT_ARG_HANDLE_CHECKED(String, type, 1);