Rollup merge of #130832 - RalfJung:sort-cfg-mess, r=workingjubilee

fix some cfg logic around optimize_for_size and 16-bit targets

Fixes https://github.com/rust-lang/rust/issues/130818.
Fixes https://github.com/rust-lang/rust/issues/129910.

There are still some warnings when building on a 16bit target:
```
warning: struct `AlignedStorage` is never constructed
   --> /home/r/src/rust/rustc.2/library/core/src/slice/sort/stable/mod.rs:135:8
    |
135 | struct AlignedStorage<T, const N: usize> {
    |        ^^^^^^^^^^^^^^
    |
    = note: `#[warn(dead_code)]` on by default

warning: associated items `new` and `as_uninit_slice_mut` are never used
   --> /home/r/src/rust/rustc.2/library/core/src/slice/sort/stable/mod.rs:141:8
    |
140 | impl<T, const N: usize> AlignedStorage<T, N> {
    | -------------------------------------------- associated items in this implementation
141 |     fn new() -> Self {
    |        ^^^
...
145 |     fn as_uninit_slice_mut(&mut self) -> &mut [MaybeUninit<T>] {
    |        ^^^^^^^^^^^^^^^^^^^

warning: function `quicksort` is never used
  --> /home/r/src/rust/rustc.2/library/core/src/slice/sort/unstable/quicksort.rs:19:15
   |
19 | pub(crate) fn quicksort<'a, T, F>(
   |               ^^^^^^^^^

warning: `core` (lib) generated 3 warnings
```

However, the cfg stuff here is sufficiently messy that I didn't want to touch more of it. I think all `feature = "optimize_for_size"` should become `any(feature = "optimize_for_size", target_pointer_width = "16")` but I am not entirely certain. Warnings are fine, Miri will just ignore them.

Cc `@Voultapher`

0 files changed, 0 insertions, 0 deletions