Turn off background compilation when running with --verify_gc, since the background compilation con…

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/cpu.h"
@@ skipping 15497 matching lines @@
 
 TokenPosition AbstractType::token_pos() const {
   // AbstractType is an abstract class.
   UNREACHABLE();
   return TokenPosition::kNoSource;
 }
 
 
 bool AbstractType::IsInstantiated(TrailPtr trail) const {
   // AbstractType is an abstract class.
+  // TODO(srdjan) : Remove temporary code.
+  if (Compiler::IsBackgroundCompilation()) {
+    UNREACHABLE();
+  }
   UNREACHABLE();
   return false;
 }
 
 
 bool AbstractType::IsFinalized() const {
   // AbstractType is an abstract class.
   UNREACHABLE();
   return false;
 }
@@ skipping 6754 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart