X64 Win64: Reimplement fmod so that it works.

src/runtime.js

 // Copyright 2006-2008 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
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 200 matching lines @@
   var x = IS_NUMBER(this) ? this : %ToNumber(this);
   if (!IS_NUMBER(y)) y = %ToNumber(y);
   return %NumberDiv(x, y);
 }
 
 
 // ECMA-262, section 11.5.3, page 49.
 function MOD(y) {
   var x = IS_NUMBER(this) ? this : %ToNumber(this);
   if (!IS_NUMBER(y)) y = %ToNumber(y);
-  return %NumberMod(x, y);
+  return %_NumberMod(x, y);
 }
 
 
 
 /* -------------------------------------------
    - - -   B i t   o p e r a t i o n s   - - -
    -------------------------------------------
 */
 
 // ECMA-262, section 11.10, page 57.
@@ skipping 362 matching lines @@
   throw %MakeTypeError('cannot_convert_to_primitive', []);
 }
 
 
 // NOTE: Setting the prototype for Array must take place as early as
 // possible due to code generation for array literals.  When
 // generating code for a array literal a boilerplate array is created
 // that is cloned when running the code.  It is essiential that the
 // boilerplate gets the right prototype.
 %FunctionSetPrototype($Array, new $Array(0));