[VIRT-349 # QEMU SVE2 Support ]

More progress on insn implementation; just about done with all of the indexed multiply. Perhaps 10 insns remaining.

Assad mentioned on irc that he has fixed the Armie bug that prevented RISU from running properly, so I hope to start doing some testing soon.

[VIRT-327 # Richard's upstream QEMU work ]

Reviewed Peter's decodetree conversion. Posted some extracts from my sve2 branch that may be relevant and helpful.

r~