Fully remove rustc_middle::ich.

Author: cjgillot

compiler/rustc_middle/src/ich.rs

@@ -84,7 +84,6 @@ pub mod arena;
 #[macro_use]
 pub mod dep_graph;
 pub mod hir;
-pub mod ich;
 pub mod infer;
 pub mod lint;
 pub mod middle;

compiler/rustc_middle/src/lib.rs

@@ -110,6 +110,7 @@ mod context;
 mod diagnostics;
 mod erase_regions;
 mod generics;
+mod impls_ty;
 mod instance;
 mod list;
 mod structural_impls;