Introduce Array.splice builtin.

src/array.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 548 matching lines @@
 
   result.length = end_i - start_i;
 
   return result;
 }
 
 
 function ArraySplice(start, delete_count) {
   var num_arguments = %_ArgumentsLength();
 
-  // SpiderMonkey and KJS return undefined in the case where no
+  // SpiderMonkey and JSC return undefined in the case where no
   // arguments are given instead of using the implicit undefined
   // arguments.  This does not follow ECMA-262, but we do the same for
   // compatibility.
+  // TraceMonkey follows ECMA-262 though.
   if (num_arguments == 0) return;
 
   var len = TO_UINT32(this.length);
   var start_i = TO_INTEGER(start);
 
   if (start_i < 0) {
     start_i += len;
     if (start_i < 0) start_i = 0;
   } else {
     if (start_i > len) start_i = len;
   }
 
-  // SpiderMonkey and KJS treat the case where no delete count is
+  // SpiderMonkey, TraceMonkey and JSC treat the case where no delete count is
   // given differently from when an undefined delete count is given.
   // This does not follow ECMA-262, but we do the same for
   // compatibility.
   var del_count = 0;
   if (num_arguments > 1) {
     del_count = TO_INTEGER(delete_count);
     if (del_count < 0) del_count = 0;
     if (del_count > len - start_i) del_count = len - start_i;
   } else {
     del_count = len - start_i;
@@ skipping 549 matching lines @@
     ArrayIndexOf: 1,
     ArrayLastIndexOf: 1,
     ArrayPush: 1,
     ArrayReduce: 1,
     ArrayReduceRight: 1
   });
 }
 
 
 SetupArray();