Reset top-level class finalization

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index a0e5ccad6ab86b51695b00d14d19e32f8f042380..ad309daa27eed48a28f0af904eee4da571a7c3a4 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -3537,6 +3537,14 @@ void Class::set_is_finalized() const {
 }
 
 
+void Class::ResetFinalization() const {
+  ASSERT(IsTopLevel());
+  set_state_bits(ClassFinalizedBits::update(RawClass::kAllocated,
+                                            raw_ptr()->state_bits_));
+  set_state_bits(TypeFinalizedBit::update(false, raw_ptr()->state_bits_));

[regis, 2015/12/02 00:32:06]

I wonder about the field offset calculations. The current next_offset_field is
not correct anymore, but I am not sure if it is used at all if the class is not
finalized. It may be fine to leave it unchanged. It will be set correctly when
CalculateFieldOffsets() is called again.

+}
+
+
 void Class::set_is_prefinalized() const {
   ASSERT(!is_finalized());
   set_state_bits(ClassFinalizedBits::update(RawClass::kPreFinalized,