[test] Fix gc-stress failures of regress-crbug-500497.js

test/mjsunit/regress/regress-crbug-500497.js

Index: test/mjsunit/regress/regress-crbug-500497.js
diff --git a/test/mjsunit/regress/regress-crbug-500497.js b/test/mjsunit/regress/regress-crbug-500497.js
index 9117440c2c843fe0b37ee68f5cd059e2b7314d1c..2d3d40f0f774061bfe31864bcd1f7d76eb4be320 100644
--- a/test/mjsunit/regress/regress-crbug-500497.js
+++ b/test/mjsunit/regress/regress-crbug-500497.js
@@ -13,6 +13,9 @@ function Ctor() {
 }
 
 for (var i = 0; i < 120; i++) {
+  // This print() is important! Without it, in --gc-stress mode, the function
+  // Ctor is optimized too early. No idea why.
+  print(i);
   // Make the "a" property long-lived, while everything else is short-lived.
   global.push(Ctor().a);
   (function FillNewSpace() { new Array(10000); })();