[turbofan] Implement tail calls with differing stack parameter counts

test/mjsunit/call-runtime-tail.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --nostress-opt --turbo
 
 var p0 = new Object();
 var p1 = new Object();
 var p2 = new Object();
 
@@ skipping 32 matching lines @@
 var count3 = 100000;
 tailee3 = function(px) {
   "use strict";
   if (count3-- == 0) {
     return this;
   }
   return %_CallFunction(px, this, tailee3);
 };
 
 %OptimizeFunctionOnNextCall(tailee3);
-assertThrows(function() { tailee3.call(p1, p2); });
+assertEquals(p1, tailee3.call(p1, p2));
 
 // Ensure too many parameters defeats the tail call optimization (currently
 // unsupported).
 var count4 = 1000000;
 tailee4 = function(px) {
   "use strict";
   if (count4-- == 0) {
     return this;
   }
   return %_CallFunction(this, px, undefined, tailee4);
 };
 
 %OptimizeFunctionOnNextCall(tailee4);
 assertThrows(function() { tailee4.call(p1, p2); });
 
 // Ensure too few parameters defeats the tail call optimization (currently
 // unsupported).
 var count5 = 1000000;
 tailee5 = function(px) {
   "use strict";
   if (count5-- == 0) {
     return this;
   }
   return %_CallFunction(this, tailee5);
 };
 
 %OptimizeFunctionOnNextCall(tailee5);
 assertThrows(function() { tailee5.call(p1, p2); });