Auto merge of #115964 - bjorn3:cgu_reuse_tracker_global_state, r=cjgillot

Remove cgu_reuse_tracker from Session

This removes a bit of global mutable state.

It will now miss post-lto cgu reuse when ThinLTO determines that a cgu doesn't get changed, but there weren't any tests for this anyway and a test for it would be fragile to the exact implementation of ThinLTO in LLVM.

compiler/rustc_incremental/src/lib.rs

@@ -16,7 +16,6 @@ extern crate rustc_middle;
 extern crate tracing;
 
 mod assert_dep_graph;
-pub mod assert_module_sources;
 mod errors;
 mod persist;