Fix test-heap/OptimizedPretenuringAllocationFolding wrt concurrent recompilation delay.

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index a0360a75a7650387c801936f38a9e4aeb7b90503..ff9e51a621ab7f4c634d4de79722134265c8eabf 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -2210,10 +2210,10 @@ TEST(OptimizedPretenuringAllocationFolding) {
       "var number_elements = 20000;"
       "var elements = new Array();"
       "function f() {"
-      "  for (var i = 0; i < 20000-1; i++) {"
+      "  for (var i = 0; i < number_elements; i++) {"
       "    elements[i] = new DataObject();"
       "  }"
-      "  return new DataObject()"
+      "  return elements[number_elements-1]"
       "};"
       "f(); f(); f();"
       "%OptimizeFunctionOnNextCall(f);"