x86/asm: Use CC_SET()/CC_OUT() in __gen_sigismember()

Replace open-coded set instructions with CC_SET()/CC_OUT().

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20180814165951.13538-1-ubizjak@gmail.com