Simplify Array.splice by simply returning the result of AllocateEmptyJSArray....

src/builtins.cc

 // 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 647 matching lines @@
   FixedArray* elms = FixedArray::cast(elms_obj);
   JSArray* array = JSArray::cast(receiver);
   ASSERT(array->HasFastElements());
 
   int len = Smi::cast(array->length())->value();
 
   int n_arguments = args.length() - 1;
 
   // Return empty array when no arguments are supplied.
   if (n_arguments == 0) {
-    Object* result = AllocateEmptyJSArray();
-    if (result->IsFailure()) return result;
-    return JSArray::cast(result);
+    return AllocateEmptyJSArray();
   }
 
   int relative_start = 0;
   Object* arg1 = args[1];
   if (arg1->IsSmi()) {
     relative_start = Smi::cast(arg1)->value();
   } else if (!arg1->IsUndefined()) {
     return CallJsBuiltin("ArraySplice", args);
   }
   int actual_start = (relative_start < 0) ? Max(len + relative_start, 0)
@@ skipping 852 matching lines @@
       if (entry->contains(pc)) {
         return names_[i];
       }
     }
   }
   return NULL;
 }
 
 
 } }  // namespace v8::internal