[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #21 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #20)
> +      && DECL_SOURCE_LOCATION (decl) != BUILTINS_LOCATION

This seems reasonable.