improve ioctl time64 conversion fallback framework

record offsets of individual slots that expand from 32- to 64-bit,
rather than timespec/timeval pairs. this flexibility will be needed
for some ioctls. reduce size of types in table. adjust representation
of offsets to include a count rather than needing -1 padding so that
the table is less ugly and doesn't need large diffs if we increase max
number of slots.

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