rustfmt no longer builds after rust-lang/rust#76027

[rust-highfive]

Hello, this is your friendly neighborhood mergebot.
After merging PR #76027, I observed that the tool rustfmt no longer builds.
A follow-up PR to the repository https://github.com/rust-lang/rustfmt is needed to fix the fallout.

cc @davidtwco, do you think you would have time to do the follow-up work?
If so, that would be great!

And nominating for compiler team prioritization.

[calebcartwright]

Will have to bump the rustc-ap crates in rustfmt to resolve. At a minimum the steps will include:

• (1) land Restore public visibility on some parsing functions for rustfmt #76115
• (2) publish new versions of rustc-ap crates (v677)
• (3) bump rustc-ap* in racer and publish new version on crates.io (bump rustc-ap crates to v677 racer-rust/racer#1129)
• (3) bump rustc-ap* on rustfmt 1.x branch and publish new version on crates.io (bump rustc-ap crates to v677 rustfmt#4411)
• (4) update racer and rustfmt references in rls (bump racer and rustfmt versions rls#1696)
• (5) update rustfmt and rls submods in rust-lang/rust repo (Update RLS and Rustfmt #76385)

Note that the rustc-ap bumps in racer and rustfmt can be done in parallel (step 3's), the other tasks all have to be sequenced