Updated parser to produce error when trying to reinitialize final variables in class constructors. …

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 62844ac892779b7ad81664024b61fa86d0e9c57b..f944221720f8d99861882bafc8885bdfb2fab084 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -8169,6 +8169,11 @@ bool Field::IsConsistentWith(const Field& other) const {
 }
 
 
+bool Field::IsFinalAndInitialized() const {
+  return is_final() && (guarded_cid() != kIllegalCid);
+}
+
+
 bool Field::IsUninitialized() const {
   const Instance& value = Instance::Handle(raw_ptr()->value_.static_value_);
   ASSERT(value.raw() != Object::transition_sentinel().raw());