Continued work on 64-bit shifts. I've tidied up most of the nastiness I
had in my first attempt at this work, unified the logic into fewer
places, and fixed the one logic error that I knew about. I had a
mysterious reload bug that just wouldn't go away, but having stared at
it for some time I've decided that what I was doing wasn't the best
option in any case, and the new way seems to work. I still have the
problem that register-allocation prefers to allocate the values in
core-registers, even when it would seem to me to work better in NEON.
This maybe because the shift amount must be negated in some cases, and
there isn't a neon instruction for that.
Continued trying to use LAVA to do builds. Unfortunately this seems to
have hit against a lava-test bug. Filed as lp:915915.
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