Fix Function subclassing.

src/transitions-inl.h

Index: src/transitions-inl.h
diff --git a/src/transitions-inl.h b/src/transitions-inl.h
index ca25b5bac0710fef1cf4a2bd6e9bce34ac10cd39..62c7a43b100da52a4906d2cb5d21994970e3b643 100644
--- a/src/transitions-inl.h
+++ b/src/transitions-inl.h
@@ -112,6 +112,8 @@ bool TransitionArray::IsSpecialTransition(Name* name) {
   return name == heap->nonextensible_symbol() ||
          name == heap->sealed_symbol() || name == heap->frozen_symbol() ||
          name == heap->elements_transition_symbol() ||
+         name == heap->strict_function_transition_symbol() ||
+         name == heap->strong_function_transition_symbol() ||
          name == heap->observed_symbol();
 }
 #endif