s390/spinlock: use R constraint in inline assembly
Allow the compiler to generate slightly better code by using the R
constraint.
Signed-off-by: 
Heiko Carstens <hca@linux.ibm.com>
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Allow the compiler to generate slightly better code by using the R
constraint.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>