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target-s390x: Mask the SIGP order_code to 8bit.
According to "CPU Signaling and Response", "Signal-Processor Orders", the order field is bit position 56-63. Without this, the Linux guest kernel is sometimes unable to stop emulation and enters an infinite loop of "XXX unknown sigp: 0xffffffff00000005". Signed-off-by: Philipp Kern <phil@philkern.de> Reviewed-by: Thomas Huth <thuth@tuxfamily.org> [agraf: add comment according to email] Signed-off-by: Alexander Graf <agraf@suse.de> (cherry picked from commit 601b9a9) Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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