Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/string-charcodeat.js

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+// Flags: --allow-natives-syntax
+
 /**
  * @fileoverview Check all sorts of borderline cases for charCodeAt.
  */
 
 function Cons() {
   return "Te" + "st testing 123";
 }
 
 
 function Deep() {
@@ skipping 114 matching lines @@
 TestStringType(Slice16End, true);
 TestStringType(Flat16, true);
 TestStringType(NotAString16, true);
 
 
 function ConsNotSmiIndex() {
   var str = Cons();
   assertTrue(isNaN(str.charCodeAt(0x7fffffff)));
 }
 
-for (var i = 0; i < 100000; i++) {
+for (var i = 0; i < 5; i++) {
   ConsNotSmiIndex();
 }
+%OptimizeFunctionOnNextCall(ConsNotSmiIndex);
+ConsNotSmiIndex();
 
 
 for (var i = 0; i != 10; i++) {
   assertEquals(101, Cons16().charCodeAt(1.1));
   assertEquals('e', Cons16().charAt(1.1));
 }
 
 function StupidThing() {
   // Doesn't return a string from toString!
   this.toString = function() { return 42; }
@@ skipping 40 matching lines @@
 
 function directlyOnPrototype() {
   assertEquals(97, "a".x(0));
   assertEquals(98, "b".x(0));
   assertEquals(99, "c".x(0));
   assertEquals(97, "a".x(0));
   assertEquals(98, "b".x(0));
   assertEquals(99, "c".x(0));
 }
 
-for (var i = 0; i < 10000; i++) {
+for (var i = 0; i < 5; i++) {
   directlyOnPrototype();
 }
+%OptimizeFunctionOnNextCall(directlyOnPrototype);
+directlyOnPrototype();