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Instruction format RSY_RDRU is a duplicate of RSY_RURD2. Use the latter,
as it follows the s390-specific conventions for instruction format
naming used in binutils.
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>