VM: New, faster default Map construction.

runtime/lib/linked_hash_map.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 
 #include "vm/assembler.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/exceptions.h"
 #include "vm/flags.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
 
 namespace dart {
 
-DEFINE_NATIVE_ENTRY(LinkedHashMap_allocate, 1) {
-  const TypeArguments& type_arguments =
-      TypeArguments::CheckedHandle(arguments->NativeArgAt(0));
-  const LinkedHashMap& map =
-    LinkedHashMap::Handle(LinkedHashMap::NewDefault());
-  map.SetTypeArguments(type_arguments);
-  return map.raw();
-}
-
-
 DEFINE_NATIVE_ENTRY(LinkedHashMap_getIndex, 1) {
   const LinkedHashMap& map =
       LinkedHashMap::CheckedHandle(arguments->NativeArgAt(0));
   return map.index();
 }
 
 
 DEFINE_NATIVE_ENTRY(LinkedHashMap_setIndex, 2) {
   const LinkedHashMap& map =
       LinkedHashMap::CheckedHandle(arguments->NativeArgAt(0));
@@ skipping 65 matching lines @@
 DEFINE_NATIVE_ENTRY(LinkedHashMap_setUsedData, 2) {
   const LinkedHashMap& map =
       LinkedHashMap::CheckedHandle(arguments->NativeArgAt(0));
   const Smi& usedData =
       Smi::CheckedHandle(arguments->NativeArgAt(1));
   map.SetUsedData(usedData.Value());
   return Object::null();
 }
 
 }  // namespace dart