Rollup merge of #33970 - arielb1:normal-type-check, r=eddyb

normalize types in MIR typeck after erasing regions

this fixes the MIR bug @frankmcsherry encountered.

r? @eddyb

src/test/run-pass/mir_call_with_associated_type.rs

@@ -0,0 +1,29 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(rustc_attrs)]
+
+trait Trait {
+    type Type;
+}
+
+impl<'a> Trait for &'a () {
+    type Type = u32;
+}
+
+#[rustc_mir]
+fn foo<'a>(t: <&'a () as Trait>::Type) -> <&'a () as Trait>::Type {
+    t
+}
+
+#[rustc_mir]
+fn main() {
+    assert_eq!(foo(4), 4);
+}