Merge #4173

Merge #4173

4173: Use core instead of std for builtin derive macros r=edwin0cheng a=edwin0cheng

Fixed #4087.

We can't use `$crate` here right now because :

1. We have to able to detect `macro` 2.0 in collecting phase for finding `rustc_builtin_macro` attrs.
2. And we have to make hygiene works for builtin derive macro.

r= @flodiebold

Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>