Create read only handles for empty_array and sentinel objects

vm/stub_code_x64_test.cc

 // Copyright (c) 2011, 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/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/isolate.h"
 #include "vm/dart_entry.h"
 #include "vm/native_entry.h"
@@ skipping 52 matching lines @@
   extern const Function& RegisterFakeFunction(const char* name,
                                               const Code& code);
   const int value1 = 10;
   const int value2 = 20;
   const char* kName = "Test_CallRuntimeStubCode";
   Assembler _assembler_;
   GenerateCallToCallRuntimeStub(&_assembler_, value1, value2);
   const Code& code = Code::Handle(Code::FinalizeCode(
       *CreateFunction("Test_CallRuntimeStubCode"), &_assembler_));
   const Function& function = RegisterFakeFunction(kName, code);
-  const Array& args = Array::Handle(Object::empty_array());
   Smi& result = Smi::Handle();
-  result ^= DartEntry::InvokeStatic(function, args);
+  result ^= DartEntry::InvokeStatic(function, Object::empty_array());
   EXPECT_EQ((value1 - value2), result.Value());
 }
 
 
 // Test calls to stub code which calls into a leaf runtime entry.
 static void GenerateCallToCallLeafRuntimeStub(Assembler* assembler,
                                               int value1,
                                               int value2) {
   const Smi& smi1 = Smi::ZoneHandle(Smi::New(value1));
   const Smi& smi2 = Smi::ZoneHandle(Smi::New(value2));
@@ skipping 11 matching lines @@
   extern const Function& RegisterFakeFunction(const char* name,
                                               const Code& code);
   const int value1 = 10;
   const int value2 = 20;
   const char* kName = "Test_CallLeafRuntimeStubCode";
   Assembler _assembler_;
   GenerateCallToCallLeafRuntimeStub(&_assembler_, value1, value2);
   const Code& code = Code::Handle(Code::FinalizeCode(
       *CreateFunction("Test_CallLeafRuntimeStubCode"), &_assembler_));
   const Function& function = RegisterFakeFunction(kName, code);
-  const Array& args = Array::Handle(Object::empty_array());
   Smi& result = Smi::Handle();
-  result ^= DartEntry::InvokeStatic(function, args);
+  result ^= DartEntry::InvokeStatic(function, Object::empty_array());
   EXPECT_EQ((value1 + value2), result.Value());
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64