Cannot implement certain built-in traits like `Copy` or `Drop` for free alias types that expand to otherwise legal self type

[fmease]

We just need to call expand_free_alias_tys on the self type in the relevant places in rustc_hir_analysis::coherence::builtin. It's a bit annoying, yh.

Example reproducers:

#![feature(lazy_type_alias)]

#[derive(Clone)]
pub struct Local;

type Alias = Local;
impl Copy for Alias {} //~ ERROR the trait `Copy` cannot be implemented for this type

#![feature(lazy_type_alias)]

pub struct Local;

type Alias = Local;
impl Drop for Alias {} //~ ERROR the `Drop` trait may only be implemented for local structs, enums, and unions