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

Fix two ppc fp launchpad bugs. Resurect patches for openrisc v1.3 Once-over review of risc-v vector extension. Posted v3 of a32 coversion to decodetree.

Started poking at neon conversion to decodetree, as a prerequisite to a32 support for fp16.

Some cleanups to watchpoints. Generic stuff now queued to tcg-next. DavidH is taking care of target/s390x updates, but there are some changes wanted within target/arm SVE code.

r~