translations(rustc_session): migrate the file cgu_reuse_tracker

This commit migrates the errors that indicates an incorrect
CGU type and the fatal error that indicates that a CGU has
not been correctly recorded

compiler/rustc_session/src/lib.rs

@@ -8,9 +8,12 @@
 #![feature(map_many_mut)]
 #![recursion_limit = "256"]
 #![allow(rustc::potential_query_instability)]
+#![deny(rustc::untranslatable_diagnostic)]
+#![deny(rustc::diagnostic_outside_of_impl)]
 
 #[macro_use]
 extern crate rustc_macros;
+pub mod errors;
 
 pub mod cgu_reuse_tracker;
 pub mod utils;