Create read only handles for empty_array and sentinel objects

vm/dart_entry_test.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 "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/object.h"
@@ skipping 21 matching lines @@
   EXPECT(ClassFinalizer::FinalizePendingClasses());
   Class& cls = Class::Handle(
       lib.LookupClass(String::Handle(Symbols::New("A"))));
   EXPECT(!cls.IsNull());
   String& name = String::Handle(String::New("foo"));
   Function& function = Function::Handle(cls.LookupStaticFunction(name));
   EXPECT(!function.IsNull());
 
   EXPECT(CompilerTest::TestCompileFunction(function));
   EXPECT(function.HasCode());
-  const Array& args = Array::Handle(Object::empty_array());
-  const Smi& retval = Smi::Handle(
-      reinterpret_cast<RawSmi*>(DartEntry::InvokeStatic(function, args)));
+  const Smi& retval = Smi::Handle(reinterpret_cast<RawSmi*>(
+      DartEntry::InvokeStatic(function, Object::empty_array())));
   EXPECT_EQ(Smi::New(42), retval.raw());
 }
 
 
 TEST_CASE(InvokeStatic_CompileError) {
   const char* kScriptChars =
       "class A {\n"
       "  static foo() { return ++++; }\n"
       "}\n";
   String& url = String::Handle(String::New("dart-test:DartEntry"));
   String& source = String::Handle(String::New(kScriptChars));
   Script& script = Script::Handle(Script::New(url,
                                               source,
                                               RawScript::kScriptTag));
   Library& lib = Library::Handle(Library::CoreLibrary());
   EXPECT_EQ(true, CompilerTest::TestCompileScript(lib, script));
   EXPECT(ClassFinalizer::FinalizePendingClasses());
   Class& cls = Class::Handle(
       lib.LookupClass(String::Handle(Symbols::New("A"))));
   EXPECT(!cls.IsNull());
   String& name = String::Handle(String::New("foo"));
   Function& function = Function::Handle(cls.LookupStaticFunction(name));
   EXPECT(!function.IsNull());
   GrowableArray<const Object*> arguments;
-  const Array& args = Array::Handle(Object::empty_array());
-  const Object& retval = Object::Handle(DartEntry::InvokeStatic(function,
-                                                                args));
+  const Object& retval = Object::Handle(
+      DartEntry::InvokeStatic(function, Object::empty_array()));
   EXPECT(retval.IsError());
   EXPECT_SUBSTRING("++++", Error::Cast(retval).ToErrorCString());
 }
 
 
 TEST_CASE(InvokeDynamic_CompileError) {
   const char* kScriptChars =
       "class A {\n"
       "  foo() { return ++++; }\n"
       "}\n";
@@ skipping 29 matching lines @@
   args.SetAt(0, instance);
   const Object& retval = Object::Handle(DartEntry::InvokeDynamic(function,
                                                                  args));
   EXPECT(retval.IsError());
   EXPECT_SUBSTRING("++++", Error::Cast(retval).ToErrorCString());
 }
 
 #endif  // TARGET_ARCH_IA32 || TARGET_ARCH_X64.
 
 }  // namespace dart