[vm] Read interface_target_reference from kernel binaries

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 7ec32463f79441d341e6206b1e5fa6a4544c6a07..cf34a3a52df6e3e8c8ee58100156e9bb5e0f3b1a 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -109,6 +109,7 @@ Object* Object::null_object_ = NULL;
 Array* Object::null_array_ = NULL;
 String* Object::null_string_ = NULL;
 Instance* Object::null_instance_ = NULL;
+Function* Object::null_function_ = NULL;
 TypeArguments* Object::null_type_arguments_ = NULL;
 TypeArguments* Object::empty_type_arguments_ = NULL;
 Array* Object::empty_array_ = NULL;
@@ -503,6 +504,7 @@ void Object::InitOnce(Isolate* isolate) {
   null_array_ = Array::ReadOnlyHandle();
   null_string_ = String::ReadOnlyHandle();
   null_instance_ = Instance::ReadOnlyHandle();
+  null_function_ = Function::ReadOnlyHandle();
   null_type_arguments_ = TypeArguments::ReadOnlyHandle();
   empty_type_arguments_ = TypeArguments::ReadOnlyHandle();
   empty_array_ = Array::ReadOnlyHandle();
@@ -535,6 +537,7 @@ void Object::InitOnce(Isolate* isolate) {
   *null_array_ = Array::null();
   *null_string_ = String::null();
   *null_instance_ = Instance::null();
+  *null_function_ = Function::null();
   *null_type_arguments_ = TypeArguments::null();
 
   // Initialize the empty and zero array handles to null_ in order to be able to
@@ -947,6 +950,8 @@ void Object::InitOnce(Isolate* isolate) {
   ASSERT(null_string_->IsString());
   ASSERT(!null_instance_->IsSmi());
   ASSERT(null_instance_->IsInstance());
+  ASSERT(!null_function_->IsSmi());
+  ASSERT(null_function_->IsFunction());
   ASSERT(!null_type_arguments_->IsSmi());
   ASSERT(null_type_arguments_->IsTypeArguments());
   ASSERT(!empty_type_arguments_->IsSmi());