in nightly, std::thread_local! uses unreachable! where it needs to say $crate::unreachable!

Commit 36c9045 introduced two lines that say unreachable!(), which breaks this code (playground):

#![no_implicit_prelude]
::std::thread_local! {static Q: () = (); }

I believe they need to say $crate::unreachable! instead.

Also, if there isn't one already, we should create a regression test for this - #![no_implicit_prelude] seems easy to break by accident.

Fix `thread_local!` macro to be compatible with `no_implicit_prelude`

Rollup merge of rust-lang#95557 - niluxv:issue-95533, r=dtolnay

Fixed by #95557, now merged into master so this can be closed I think.

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