remove folded_before_codegen attribute

vyper/builtins/functions.py

@@ -111,8 +111,6 @@ class FoldedFunction(BuiltinFunction):
     # Since foldable builtin functions are not folded before semantics validation,
     # this flag is used for `check_variable_constancy` in semantics validation.
     _kwargable = True
-    # Skip annotation of builtins if it will be folded before codegen
-    _always_folded_before_codegen = True
 
 
 class TypenameFoldedFunction(FoldedFunction):
@@ -2289,9 +2287,6 @@ def build_IR(self, expr, args, kwargs, context):
 
 class Empty(TypenameFoldedFunction):
     _id = "empty"
-    # Since `empty` is not folded in the AST, `is_folded` is set to False
-    # so that it will be properly annotated.
-    _always_folded_before_codegen = False
 
     def fetch_call_return(self, node):
         type_ = self.infer_arg_types(node)[0].typedef

vyper/semantics/analysis/local.py

@@ -684,9 +684,6 @@ def visit_Call(self, node: vy_ast.Call, typ: VyperType) -> None:
             for arg, arg_type in zip(node.args, call_type.arg_types):
                 self.visit(arg, arg_type)
         else:
-            if getattr(call_type, "_always_folded_before_codegen", False):
-                return
-
             # builtin functions
             arg_types = call_type.infer_arg_types(node, typ)
             # `infer_arg_types` already calls `validate_expected_type`