BITOR
$$ = build_binary($1, BITOR, $3, $4);
op == BITAND || op == BITXOR || op == BITOR ||
case BITOR:
case BITOR:
lint_assert(op == BITAND || op == BITXOR || op == BITOR);
if (op == ORASS || op == BITOR || op == BITXOR) {
case BITOR: