Rollup merge of #155063 - josetorrs:refactor-alias-free, r=WaffleLapkin

`ty::Alias`: replace `def_id: did` with `def_id`

related issue: https://github.com/rust-lang/rust/issues/154941

tackling this task:

- [x] replace def_id: did with def_id where possible

r? @WaffleLapkin