Convert all symbols accessor to return read only handles so that it is not necessary to create a ne…

vm/megamorphic_cache_table.cc

 // Copyright (c) 2012, 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 "vm/megamorphic_cache_table.h"
 
 #include <stdlib.h>
 #include "vm/object.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
@@ skipping 36 matching lines @@
   return cache.raw();
 }
 
 
 void MegamorphicCacheTable::InitMissHandler() {
   // The miss handler for a class ID not found in the table is invoked as a
   // normal Dart function.
   const Code& code =
       Code::Handle(StubCode::Generate("_stub_MegamorphicMiss",
                                       StubCode::GenerateMegamorphicMissStub));
-  const String& name = String::Handle(Symbols::New("megamorphic_miss"));
   const Class& cls =
       Class::Handle(Type::Handle(Type::Function()).type_class());
   const Function& function =
-      Function::Handle(Function::New(name,
+      Function::Handle(Function::New(Symbols::MegamorphicMiss(),
                                      RawFunction::kRegularFunction,
                                      false,  // Not static.
                                      false,  // Not const.
                                      false,  // Not abstract.
                                      false,  // Not external.
                                      cls,
                                      0));  // No token position.
   function.SetCode(code);
   miss_handler_ = function.raw();
 }
@@ skipping 18 matching lines @@
   for (intptr_t i = 0; i < length_; ++i) {
     cache = table_[i].cache;
     buckets = cache.buckets();
     size += MegamorphicCache::InstanceSize();
     size += Array::InstanceSize(buckets.Length());
   }
   OS::Print("%"Pd" megamorphic caches using %"Pd"KB.\n", length_, size / 1024);
 }
 
 }  // namespace dart