remove bound_type_of query; make type_of return EarlyBinder; change type_of in metadata

compiler/rustc_codegen_llvm/src/debuginfo/mod.rs

@@ -508,7 +508,7 @@ impl<'ll, 'tcx> DebugInfoMethods<'tcx> for CodegenCx<'ll, 'tcx> {
                     let impl_self_ty = cx.tcx.subst_and_normalize_erasing_regions(
                         instance.substs,
                         ty::ParamEnv::reveal_all(),
-                        cx.tcx.bound_type_of(impl_def_id).skip_binder(),
+                        cx.tcx.type_of(impl_def_id).skip_binder(),
                     );
 
                     // Only "class" methods are generally understood by LLVM,