Auto merge of #112716 - compiler-errors:rollup-h77daia, r=compiler-errors

Rollup of 7 pull requests

Successful merges:

 - #111074 (Relax implicit `T: Sized` bounds on `BufReader<T>`, `BufWriter<T>` and `LineWriter<T>`)
 - #112226 (std: available_parallelism using native netbsd api first)
 - #112474 (Support 128-bit enum variant in debuginfo codegen)
 - #112662 (`#[lang_item]` for `core::ptr::Unique`)
 - #112665 (Make assumption functions in new solver take `Binder<'tcx, Clause<'tcx>>`)
 - #112684 (Disable alignment checks on i686-pc-windows-msvc)
 - #112706 (Add `SyntaxContext::is_root`)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors