Invalidate background compilation only if relevant fields were invalidated.

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 7727 matching lines @@
 void Field::RegisterDependentCode(const Code& code) const {
   ASSERT(IsOriginal());
   DEBUG_ASSERT(IsMutatorOrAtSafepoint());
   ASSERT(code.is_optimized());
   FieldDependentArray a(*this);
   a.Register(code);
 }
 
 
 void Field::DeoptimizeDependentCode() const {
+  ASSERT(Thread::Current()->IsMutatorThread());
   ASSERT(IsOriginal());
-  ASSERT(Thread::Current()->IsMutatorThread());
+  if (FLAG_background_compilation) {
+    Isolate::Current()->AddDisablingField(*this);
+  }
   FieldDependentArray a(*this);
   a.DisableCode();
 }
 
 
 bool Field::IsUninitialized() const {
   const Instance& value = Instance::Handle(raw_ptr()->value_.static_value_);
   ASSERT(value.raw() != Object::transition_sentinel().raw());
   return value.raw() == Object::sentinel().raw();
 }
@@ skipping 14196 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart