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

vm/intrinsifier_ia32.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.
 //
 // The intrinsic code below is executed before a method has built its frame.
 // The return address is on the stack and the arguments below it.
 // Registers EDX (arguments descriptor) and ECX (function) must be preserved.
 // Each intrinsification method returns true if the corresponding
 // Dart method was intrinsified.
 
@@ skipping 156 matching lines @@
   return false;
 }
 
 
 bool Intrinsifier::ImmutableArray_getIndexed(Assembler* assembler) {
   return Array_getIndexed(assembler);
 }
 
 
 static intptr_t ComputeObjectArrayTypeArgumentsOffset() {
-  const String& class_name = String::Handle(Symbols::New("_ObjectArray"));
   const Library& core_lib = Library::Handle(Library::CoreLibrary());
   const Class& cls =
-      Class::Handle(core_lib.LookupClassAllowPrivate(class_name));
+      Class::Handle(core_lib.LookupClassAllowPrivate(Symbols::ObjectArray()));
   ASSERT(!cls.IsNull());
   ASSERT(cls.HasTypeArguments());
   ASSERT(cls.NumTypeArguments() == 1);
   const intptr_t field_offset = cls.type_arguments_field_offset();
   ASSERT(field_offset != Class::kNoTypeArguments);
   return field_offset;
 }
 
 
 // Intrinsify only for Smi value and index. Non-smi values need a store buffer
@@ skipping 1542 matching lines @@
   __ Bind(&is_true);
   __ LoadObject(EAX, bool_true);
   __ ret();
   return true;
 }
 
 #undef __
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32