Rollup merge of #148994 - folkertdev:abi-compatibility-cleanup, r=jieyouxu

Abi compatibility test cleanup

r? `@jieyouxu`

- moves `NonNull` (and some friends) into `minicore.rs` so it can be re-used.
- tests the abi compatibility of a couple more targets. It's useful to have a comprehensive overview of all ABIs that rust has some amount of support for, e.g. testing for c-variadic or guaranteed tail calls (cc rust-lang/rust#148748)

Author: Zalathar