…ough, r=compiler-errors

fix ensure_monomorphic_enough

When polymorphization was still a thing, the visitor was used to only recurse into *used generic parameters* of function/closure/coroutine types and allow unused parameters (i.e. the polymorphized parameters) to remain generic.

When polymorphization got removed, this got changed to always treat all parameters as polymorphic and never recurse into them: /~https://github.com/rust-lang/rust/pull/133883/files#diff-210c59e321070d0ca4625c04e9fb064bf43ddc34082e7e33a7ee8a6c577e95afL44-L62

This is clearly wrong and can cause MIR opts to misbehave, for example this currently prints "false" in release mode:

```rust
#![feature(core_intrinsics)]

fn generic<T>() {}

const fn type_id_of_val<T: 'static>(_: &T) -> u128 {
    std::intrinsics::type_id::<T>()
}

fn cursed_is_i32<T: 'static>() -> bool {
    (const { type_id_of_val(&generic::<T>) } == const { type_id_of_val(&generic::<i32>) })
}

fn main() {
    dbg!(cursed_is_i32::<i32>());
}
```

This PR reverts to the old behavior of always treating all types that contain type parameters as too generic, like we used to do without `-Zpolymorphize` before.

~~I'm not including the above as a test case here, because I think there is little value in testing code paths that have been removed and this seems unlikely to regress in a way that would be caught by a regression test, but let me know if you disagree and want me to add a test anyway.~~

Rollup of 11 pull requests

Successful merges:

 - rust-lang#136606 (Fix long lines which rustfmt fails to format)
 - rust-lang#136663 (Stabilize `NonZero::count_ones`)
 - rust-lang#136672 (library: doc: core::alloc::Allocator: trivial typo fix)
 - rust-lang#136704 (Improve examples for file locking)
 - rust-lang#136721 (cg_llvm: Reduce visibility of some items outside the `llvm` module)
 - rust-lang#136813 (rustc_target: Add the fp16 target feature for AArch32)
 - rust-lang#136830 (fix i686-unknown-hurd-gnu x87 footnote)
 - rust-lang#136832 (Fix platform support table for i686-unknown-uefi)
 - rust-lang#136835 (Stop using span hack for contracts feature gating)
 - rust-lang#136837 (Overhaul how contracts are lowered on fn-like bodies)
 - rust-lang#136839 (fix ensure_monomorphic_enough)

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

Rollup merge of rust-lang#136839 - lukas-code:actually-monomorphic-enough, r=compiler-errors

fix ensure_monomorphic_enough

When polymorphization was still a thing, the visitor was used to only recurse into *used generic parameters* of function/closure/coroutine types and allow unused parameters (i.e. the polymorphized parameters) to remain generic.

When polymorphization got removed, this got changed to always treat all parameters as polymorphic and never recurse into them: /~https://github.com/rust-lang/rust/pull/133883/files#diff-210c59e321070d0ca4625c04e9fb064bf43ddc34082e7e33a7ee8a6c577e95afL44-L62

This is clearly wrong and can cause MIR opts to misbehave, for example this currently prints "false" in release mode:

```rust
#![feature(core_intrinsics)]

fn generic<T>() {}

const fn type_id_of_val<T: 'static>(_: &T) -> u128 {
    std::intrinsics::type_id::<T>()
}

fn cursed_is_i32<T: 'static>() -> bool {
    (const { type_id_of_val(&generic::<T>) } == const { type_id_of_val(&generic::<i32>) })
}

fn main() {
    dbg!(cursed_is_i32::<i32>());
}
```

This PR reverts to the old behavior of always treating all types that contain type parameters as too generic, like we used to do without `-Zpolymorphize` before.

~~I'm not including the above as a test case here, because I think there is little value in testing code paths that have been removed and this seems unlikely to regress in a way that would be caught by a regression test, but let me know if you disagree and want me to add a test anyway.~~

[beta] backports

- Pattern Migration 2024: try to suggest eliding redundant binding modifiers rust-lang#136577, rust-lang#136857
- chore: update rustc-hash 2.1.0 to 2.1.1 rust-lang#136605
- Make `AsyncFnOnce`, `AsyncFnMut`, `AsyncFn` non-`#[fundamental]` rust-lang#136724
- fix ensure_monomorphic_enough rust-lang#136839
- Revert "Stabilize `extended_varargs_abi_support`" rust-lang#136897, rust-lang#136934

r? cuviper