Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/compiler/array-length.js

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+// Flags: --allow-natives-syntax
+
 function ArrayLength(a) { return a.length; }
 
 function Test(a0, a2, a5) {
   assertEquals(0, ArrayLength(a0));
   assertEquals(2, ArrayLength(a2));
   assertEquals(5, ArrayLength(a5));
 }
 
 var a0 = [];
 var a2 = [1,2];
 var a5 = [1,2,3,4,5];
-for (var i = 0; i < 100000; i++) Test(a0, a2, a5);
+for (var i = 0; i < 5; i++) Test(a0, a2, a5);
+%OptimizeFunctionOnNextCall(ArrayLength);
+%OptimizeFunctionOnNextCall(Test);
+Test(a0, a2, a5);
 assertEquals("undefined", typeof(ArrayLength(0)));
-for (var i = 0; i < 100000; i++) Test(a0, a2, a5);
+for (var i = 0; i < 5; i++) Test(a0, a2, a5);
+%OptimizeFunctionOnNextCall(Test);
+Test(a0, a2, a5);
 assertEquals(4, ArrayLength("hest"));