[BUG] math.ceildiv gives incorrect results for unsigned simd types

[soraros]

Bug description

As title.

fn ceildiv[T: CeilDivable, //](num: T, denom: T) -> T:
  return -(nun // -denom)  # shouldn't use __neg__ on unsigned types

Steps to reproduce

import math

fn main():
  res = math.ceildiv(UInt8(8), 2)
  print(res)  # prints 0

System information

Mojo 2024.11.305 (a9c84705) on Docker, Intel Mac