Add flag which moves super initializer statement

runtime/vm/parser.h

Index: runtime/vm/parser.h
diff --git a/runtime/vm/parser.h b/runtime/vm/parser.h
index 24ff1acdd38db5920950c8cf41cb75e1a7fcca89..433a0c47233c7e1eebe23fbe05f2303b6a686352 100644
--- a/runtime/vm/parser.h
+++ b/runtime/vm/parser.h
@@ -476,12 +476,15 @@ class Parser : public ValueObject {
       AstNode* instance,
       Field* field,
       AstNode* init_value);
-  void GenerateSuperConstructorCall(const Class& cls,
-                                    intptr_t supercall_pos,
-                                    LocalVariable* receiver,
-                                    AstNode* phase_parameter,
-                                    ArgumentListNode* forwarding_args);
-  AstNode* ParseSuperInitializer(const Class& cls, LocalVariable* receiver);
+  StaticCallNode* GenerateSuperConstructorCall(
+      const Class& cls,
+      intptr_t supercall_pos,
+      LocalVariable* receiver,
+      AstNode* phase_parameter,
+      ArgumentListNode* forwarding_args);
+  StaticCallNode* ParseSuperInitializer(
+      const Class& cls,
+      LocalVariable* receiver);
   AstNode* ParseInitializer(const Class& cls,
                             LocalVariable* receiver,
                             GrowableArray<Field*>* initialized_fields);