(`c2rust-analyze`) Support all ways of writing `addr_of!` during rewriting

[kkysen]

During rewriting, std::ptr::addr_of! seems to be special cased to an extent, as some other equivalent forms do not work. Specifically, these work:

• [x] std::ptr::addr_of!
• [x] ::std::ptr::addr_of!
• [ ] use std::ptr::addr_of, addr_of! This one wasn't working previously, but seems to be working now. It may be finicky.
• [x] core::ptr::addr_of!
• [ ] ::core::ptr::addr_of!
• [ ] use core::ptr::addr_of, addr_of!

See also https://github.com/immunant/c2rust/blob/11bf3514929133cd5ee44fe4eb5956bb0e4c07e8/c2rust-analyze/tests/analyze/string_casts.rs#L18-L21

There doesn't appear to be a specific error. Instead, this is printed:

error: aborting due to previous error

For more information about this error, try `rustc --explain E0433`.
Error: ErrorGuaranteed(())

[aneksteind]

Can you be more specific about what "doesn't work" means? Error messages would be helpful

[kkysen]

Yeah, I'll add them.

[kkysen]

Hmm, it seems that now use std::ptr::addr_of; addr_of!(x); works? In a new, separate test from master, but I don't think I touched anything related.