Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/regress/regress-1106.js

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+// Flags: --allow-natives-syntax
+
 // Test for issue 1106, where the optimizing compiler broke when accessing
 // a property lying on a prototype of the global object, and that prototype
 // object was in dictionary mode.
 
 x = Object.prototype;
 x.foo = 3;
 x.bar = 4;
 delete x.foo;
 x.foo = 5;
 
 function f() { return foo; }
 
-for (i=0 ; i < 100000; ++i) {
+for (i=0 ; i < 5; ++i) {
   assertEquals(5, f());
 }
+%OptimizeFunctionOnNextCall(f);
+assertEquals(5, f());
 
 // Test calls on functions defined in the prototype of the global object.
 x.gee = function() { return 42; }
 function g() { return gee(); }
 
-for (i=0 ; i < 100000; ++i) {
+for (i=0 ; i < 5; ++i) {
   assertEquals(42, g());
 }
+%OptimizeFunctionOnNextCall(g);
+%OptimizeFunctionOnNextCall(x.gee);
+assertEquals(42, g());