Rollup merge of #105315 - fmease:norm-subst-iat, r=compiler-errors

Normalize inherent associated types after substitution

Fixes #105314.

r? ````@cjgillot```` (#105224)
````@rustbot```` label F-inherent_associated_types

src/test/ui/associated-inherent-types/normalize-projection-0.rs

@@ -0,0 +1,22 @@
+// check-pass
+
+#![feature(inherent_associated_types)]
+#![allow(incomplete_features)]
+
+struct S<T>(T);
+
+impl<T: O> S<T> {
+    type P = <T as O>::P;
+}
+
+trait O {
+    type P;
+}
+
+impl O for i32 {
+    type P = String;
+}
+
+fn main() {
+    let _: S<i32>::P = String::new();
+}

src/test/ui/associated-inherent-types/normalize-projection-1.rs

@@ -0,0 +1,22 @@
+// check-pass
+
+#![feature(inherent_associated_types)]
+#![allow(incomplete_features)]
+
+struct S;
+
+impl S {
+    type P<T: O> = <T as O>::P;
+}
+
+trait O {
+    type P;
+}
+
+impl O for i32 {
+    type P = String;
+}
+
+fn main() {
+    let _: S::P<i32> = String::new();
+}