s390/lowcore: Use lghi instead llilh to clear register
lghi is the fastest way to clear a register. Use that intead of llilh. Suggested-by:Juergen Christ <jchrist@linux.ibm.com> Reviewed-by:
Juergen Christ <jchrist@linux.ibm.com> Signed-off-by:
Heiko Carstens <hca@linux.ibm.com> Signed-off-by:
Vasily Gorbik <gor@linux.ibm.com>
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