Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/compiler/deopt-args.js

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+// Flags: --allow-natives-syntax
+
 function g(x) {
   return x.f(0,1,2);
 }
 
 function f(a,b,c) {
   return 42;
 }
 
 var object = { };
 object.f = f;
-for (var i = 0; i < 10000000; i++) {
+for (var i = 0; i < 5; i++) {
   assertEquals(42, g(object));
 }
+%OptimizeFunctionOnNextCall(g);
+g(object);
 
 object.f = function(a,b,c) { return 87; };
 assertEquals(87, g(object));