Fix crash looking at a Code object in an AOT program with the service protocol.

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 12470 matching lines @@
   const intptr_t num_args = NumArgsTested();
   const intptr_t num_checks = NumberOfChecks();
   return OS::SCreate(Thread::Current()->zone(),
       "ICData target:'%s' num-args: %" Pd " num-checks: %" Pd "",
       name.ToCString(), num_args, num_checks);
 }
 
 
 RawFunction* ICData::Owner() const {
   Object& obj = Object::Handle(raw_ptr()->owner_);
-  if (obj.IsFunction()) {
+  if (obj.IsNull()) {
+    ASSERT(Dart::snapshot_kind() == Snapshot::kAppNoJIT);
+    return Function::null();
+  } else if (obj.IsFunction()) {
     return Function::Cast(obj).raw();
   } else {
     ICData& original = ICData::Handle();
     original ^= obj.raw();
     return original.Owner();
   }
 }
 
 
 RawICData* ICData::Original() const {
@@ skipping 10109 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart