Replace long running loops by OptimizeFunctionOnNextCall in some tests.

test/mjsunit/closures.js

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+// Flags: --allow-natives-syntax
+
 function runner(f, expected) {
-  for (var i = 0; i < 1000000; i++) {
-    assertEquals(expected, f.call(this));
-  }
+  assertEquals(expected, f.call(this));
 }
 
 function test(n) {
   function MyFunction() {
     var result = n * 2 + arguments.length;
     return result;
   }
+  for (var i = 0; i < 5; ++i) MyFunction();
+  %OptimizeFunctionOnNextCall(MyFunction)
   runner(MyFunction, n * 2);
 }
 
 test(1);
 test(42);
 test(239);