Reintroducing parser changes to cause compile-time errors when trying to reinitialize a final field…

runtime/vm/parser.h

Index: runtime/vm/parser.h
diff --git a/runtime/vm/parser.h b/runtime/vm/parser.h
index 9dd7e0f260c575af73ce1a4c859a4e2c2c292e7a..3dd35dc5086639796c59b97be1156db912458d66 100644
--- a/runtime/vm/parser.h
+++ b/runtime/vm/parser.h
@@ -563,6 +563,8 @@ class Parser : public ValueObject {
   void CheckMemberNameConflict(ClassDesc* members, MemberDesc* member);
   void ParseClassMemberDefinition(ClassDesc* members,
                                   TokenPosition metadata_pos);
+  void CheckFinalInitializationConflicts(const ClassDesc* class_desc,
+                                         const MemberDesc* member);
   void ParseParameterType(ParamList* params);
   void ParseFormalParameter(bool allow_explicit_default_value,
                             bool evaluate_metadata,