message: constify `exact_div` intrinsic
diff: @@ -368,11 +368,6 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
  }
  // Other
  - "exact_div" => {
  - let [num, denom] = check_arg_count(args)?;
  - this.exact_div(&this.read_immediate(num)?, &this.read_immediate(denom)?, dest)?;
  - }
  -
  "breakpoint" => {
  let [] = check_arg_count(args)?;
  // normally this would raise a SIGTRAP, which aborts if no debugger is connected
  