add rustc trophies

[frewsxcv]

@vegard found some bugs while fuzzing rustc 🎉 🏆

• error: internal compiler error: librustc/hir/map/mod.rs:329: local_def_id: no entry for 55, which has a map of [...] rust-lang/rust#50585
• error: internal compiler error: librustc_mir/hair/pattern/mod.rs:514: tuple struct pattern not applied to an ADT rust-lang/rust#50582
• thread 'main' panicked at 'assertion failed: self.tcx.sess.err_count() > 0', librustc_typeck/check/mod.rs:3783:19 rust-lang/rust#50581
• error: internal compiler error: librustc_mir/hair/pattern/mod.rs:465: unexpected type for tuple pattern: TyError rust-lang/rust#50577

[frewsxcv]

Also, check with vegard to see if others have been found since the filing of this issue

[vegard]

Thanks :-) I also reported:

• error: internal compiler error: librustc_mir/hair/cx/expr.rs:544: invalid loop id for break: label not found rust-lang/rust#50576
• error: internal compiler error: librustc_typeck/check/mod.rs:851: can't type-check body of DefId(0/0:3 ~ rust_out[317d]::Foo[0]) rust-lang/rust#50600
• rustc infinite loop: warning: Constant evaluating a complex constant, this might take some time rust-lang/rust#50637

FWIW, I used vegard/prog-fuzz@c80b1a7, I'm not sure whether it makes sense to attribute AFL/afl.rs since I'm only using them for the instrumentation of the compiler and not the actual fuzzing/testcase generation, but it's up to you :-)