Incorrect operation after bit shift with negative left hand side expression.

[lukyxu]

fn main() {
  let b = -5_i128 >> 2;
  println!("{}", b);
  let c = b * 3;
  println !("{}", c)
}

Expected output:
-2
-6

Actual output:
-2
6

There are similar errors when replacing the shift left operator with shift right and/or replacing the multiply operator with the division operator. Interestingly, printing both b and c afterwards println !("{} {}", b, c) results in the correct output.

[thepowersgang]

Oops, a typo in sign handling of i128 multiplication in the C backend.
Not present in the constant evaluator, which is why it works if the print is done after the calculation.