`manual_div_ceil` does not trigger for alternate form

Summary

The lint triggers for expressions of the form (a + b - 1) / b but not of the form (a - 1) / b + 1. For unsigned integers, these are equivalent ignoring overflow/underflow.

Lint Name

manual_div_ceil

Reproducer

I tried this code (playground):

fn div_ceil(a: u32, b: u32) -> u32 {
    (a - 1) / b + 1
}

I expected to see this happen:
The manual_div_ceil lint should trigger, suggesting a.div_ceil(b).

Instead, this happened:
Nothing.

Start by locating the implementation and tests for the manual_div_ceil lint, then run Clippy on the provided (a - 1) / b + 1 reproducer. Confirm that the alternate unsigned-integer form is recognized and that the diagnostic suggests a.div_ceil(b), while preserving existing behavior for the original form.