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3529d45b74
Add `NonZero*::count_ones`
This PR adds the following APIs to the standard library:
```rust
impl NonZero* {
pub const fn count_ones(self) -> NonZeroU32;
}
```
This is potentially interesting, given that `count_ones` can't ever return 0.
r? libs-api
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| std | ||
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| unwind | ||