Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/regress/regress-962.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
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 //       with the distribution.
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 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
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 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+// Flags: --allow-natives-syntax
+
 function L(scope) { this.s = new Object(); }
 
 L.prototype.c = function() { return true; }
 
 function F() {
   this.l = [new L, new L];
 }
 
 F.prototype.foo = function () {
     var f, d = arguments,
         e, b = this.l,
         g;
     for (e = 0; e < b.length; e++) {
         g = b[e];
         f = g.c.apply(g.s, d);
         if (f === false) {
             break
         }
     }
     return f
 }
 
 
 var ctx = new F;
 
-for (var i = 0; i < 10000; i++) ctx.foo();
+for (var i = 0; i < 5; i++) ctx.foo();
+%OptimizeFunctionOnNextCall(F.prototype.foo);
+ctx.foo();