Ensure objects emitted in code are allocated in old space.

runtime/vm/assembler.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/assembler.h"
 
 #include "platform/utils.h"
 #include "vm/cpu.h"
 #include "vm/heap.h"
 #include "vm/memory_region.h"
@@ skipping 130 matching lines @@
  private:
   ZoneGrowableArray<int>* pointer_offsets_;
   const Object& object_;
 };
 
 
 void AssemblerBuffer::EmitObject(const Object& object) {
   // Since we are going to store the handle as part of the fixup information
   // the handle needs to be a zone handle.
   ASSERT(object.IsZoneHandle());
+  ASSERT(object.IsOld());
   EmitFixup(new PatchCodeWithHandle(pointer_offsets_, object));
   cursor_ += kWordSize;  // Reserve space for pointer.
 }
 
 
 // Shared macros are implemented here.
 void Assembler::Unimplemented(const char* message) {
   const char* format = "Unimplemented: %s";
   const intptr_t len = OS::SNPrint(NULL, 0, format, message);
   char* buffer = reinterpret_cast<char*>(malloc(len + 1));
@@ skipping 13 matching lines @@
 
 void Assembler::Unreachable(const char* message) {
   const char* format = "Unreachable: %s";
   const intptr_t len = OS::SNPrint(NULL, 0, format, message);
   char* buffer = reinterpret_cast<char*>(malloc(len + 1));
   OS::SNPrint(buffer, len + 1, format, message);
   Stop(buffer);
 }
 
 }  // namespace dart