Create read only handles for empty_array and sentinel objects

vm/compiler.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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/code_generator.h"
@@ skipping 607 matching lines @@
     parsed_function->SetNodeSequence(fragment);
     parsed_function->set_default_parameter_values(Array::ZoneHandle());
     parsed_function->set_expression_temp_var(
         ParsedFunction::CreateExpressionTempVar(0));
     fragment->scope()->AddVariable(parsed_function->expression_temp_var());
     parsed_function->AllocateVariables();
 
     // Non-optimized code generator.
     CompileParsedFunctionHelper(*parsed_function, false);
 
-    const Array& args = Array::Handle(Object::empty_array());
-    const Object& result = Object::Handle(DartEntry::InvokeStatic(func, args));
+    const Object& result = Object::Handle(
+        DartEntry::InvokeStatic(func, Object::empty_array()));
     isolate->set_long_jump_base(base);
     return result.raw();
   } else {
     const Object& result =
       Object::Handle(isolate->object_store()->sticky_error());
     isolate->object_store()->clear_sticky_error();
     isolate->set_long_jump_base(base);
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart