Make it easier to test OSR with %OptimizeOsr() runtime call.

test/mjsunit/regress/regress-crbug-387599.js

Index: test/mjsunit/regress/regress-crbug-387599.js
diff --git a/test/mjsunit/regress/regress-crbug-387599.js b/test/mjsunit/regress/regress-crbug-387599.js
index 98750aa918261f707bdee8a05d230c2805aa11e9..753dcfa3a615ac70d0bc0b65420b189bbbb3f88c 100644
--- a/test/mjsunit/regress/regress-crbug-387599.js
+++ b/test/mjsunit/regress/regress-crbug-387599.js
@@ -8,9 +8,7 @@ Debug = debug.Debug;
 Debug.setListener(function() {});
 
 function f() {
-  for (var i = 0; i < 100; i++) {
-    %OptimizeFunctionOnNextCall(f, "osr");
-  }
+  for (var i = 0; i < 100; i++) %OptimizeOsr();
 }
 
 Debug.setBreakPoint(f, 0, 0);