Ensure objects emitted in code are allocated in old space.

runtime/vm/object_x64_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/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/object.h"
@@ skipping 14 matching lines @@
   __ incq(RCX);
   __ popq(RAX);
   __ movq(RAX, RCX);
   __ ret();
 }
 
 
 // Generate a dart code sequence that embeds a string object in it.
 // This is used to test Embedded String objects in the instructions.
 void GenerateEmbedStringInCode(Assembler* assembler, const char* str) {
-  const String& string_object = String::ZoneHandle(String::New(str));
+  const String& string_object =
+      String::ZoneHandle(String::New(str, Heap::kOld));
   __ LoadObject(RAX, string_object);
   __ ret();
 }
 
 
 // Generate a dart code sequence that embeds a smi object in it.
 // This is used to test Embedded Smi objects in the instructions.
 void GenerateEmbedSmiInCode(Assembler* assembler, intptr_t value) {
   const Smi& smi_object = Smi::ZoneHandle(Smi::New(value));
   __ LoadObject(RAX, smi_object);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64