[VIRT-249 # SVE system mode emulation ]

Fixed a bug in last week's reorg, reported by Laurent.

Fixed a bug in our risu scripts for generating sve memory ops; I was able to replicate Laurent's failure in risu, finally, and then fix it. Still need to clean up the risu patch for submission.

[Upstream]

Reviewed mips mxu tcg patch set. Reviewed s390 afp tcg patch set.

r~