Pop two integers from the stack; let @var{a} be the next-to-top value,
and @var{b} be the top value. Shift @var{a} right by @var{b} bits,
inserting copies of the top bit at the high end, and push the result.
Pop two integers from the stack; let @var{a} be the next-to-top value,
and @var{b} be the top value. Shift @var{a} right by @var{b} bits,
inserting copies of the top bit at the high end, and push the result.