Tracking issue for re-enabling incremental compilation

[neysofu]

Possible culprits:

• error: found unstable fingerprints for evaluate_obligation rust-lang/rust#83291
• ICE: unstable fingerprints for evaluate_obligation rust-lang/rust#91114
• thread 'rustc' panicked at 'found unstable fingerprints for evaluate_obligation(b221e4f0760c8617-1fd22c69d1158f36)', /rustc/f5d8117c338a788bd24abec733fd143dfceb25a0\compiler\rustc_query_system\src\query\plumbing.rs:593:5 rust-lang/rust#83226

[neysofu]

rust-lang/rust#91114 seems very promising because it also involves graphql_parser, so it's probably the exact same bug.