Make hasNext a getter instead of a method.

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index b8941e2c54f2d11715bf120edd4a14bd2bdeca3e..9058b8dbba1cbbf5f03f4e9243f1c342543ddb49 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -5688,11 +5688,10 @@ AstNode* Parser::ParseForInStatement(intptr_t forin_pos,
   current_block_->statements->Add(iterator_init);
 
   // Generate while loop condition.
-  AstNode* iterator_has_next = new InstanceCallNode(
+  AstNode* iterator_has_next = new InstanceGetterNode(
       collection_pos,
       new LoadLocalNode(collection_pos, iterator_var),
-      String::ZoneHandle(Symbols::HasNext()),
-      no_args);
+      String::ZoneHandle(Symbols::HasNext()));
 
   // Parse the for loop body. Ideally, we would use ParseNestedStatement()
   // here, but that does not work well because we have to insert an implicit