…iaskrgr

Rollup of 9 pull requests

Successful merges:

 - rust-lang#126822 (Bootstrap command refactoring: port more `Command` usages to `BootstrapCmd` (step 2))
 - rust-lang#126835 (Simplifications in match lowering)
 - rust-lang#126953 (std: separate TLS key creation from TLS access)
 - rust-lang#127045 (Rename `super_predicates_of` and similar queries to `explicit_*` to note that they're not elaborated)
 - rust-lang#127075 (rustc_data_structures: Explicitly check for 64-bit atomics support)
 - rust-lang#127101 (remove redundant match statement from dataflow const prop)
 - rust-lang#127102 (Rename fuchsia builder and bump Fuchsia)
 - rust-lang#127103 (Move binder and polarity parsing into `parse_generic_ty_bound`)
 - rust-lang#127108 (unify `dylib` and `bin_helpers` and create `shared_helpers::parse_value_from_args`)

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

Rollup merge of rust-lang#127103 - compiler-errors:tighten-trait-bound-parsing, r=fmease

Move binder and polarity parsing into `parse_generic_ty_bound`

Let's pull out the parts of rust-lang#127054 which just:
1. Make the parsing code less confusing
2. Fix `?use<>` (to correctly be denied)
3. Improve `T: for<'a> 'a` diagnostics

This should have no user-facing effects on stable parsing.

r? fmease