Make GCMole happy

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 4fecb0bd24fd0a23db36ece3c3595ffb74dd5012..4ee7734a2f78c91cfce410268e5954ab35fd614d 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -11092,8 +11092,9 @@ void Map::ZapPrototypeTransitions() {
 
 void Map::AddDependentCompilationInfo(DependentCode::DependencyGroup group,
                                       CompilationInfo* info) {
-  Handle<DependentCode> codes = DependentCode::Insert(
-      Handle<DependentCode>(dependent_code()), group, info->object_wrapper());
+  Handle<DependentCode> dep(dependent_code());
+  Handle<DependentCode> codes =
+      DependentCode::Insert(dep, group, info->object_wrapper());
   if (*codes != dependent_code()) set_dependent_code(*codes);
   info->dependent_maps(group)->Add(Handle<Map>(this), info->zone());
 }