Always resched in thread queue rotation.

It might be time to reschedule anyway, some games call this in a loop with
an empty queue.

May help Harukanaru Toki No Naka de Hachiyoushou (#4669.)
When ins is used with a zero argument, don't OR.

Seems it's used effectively to mask out bits with rs=zero.  Makes sense...
Merge pull request #4677 from unknownbrackets/perf

Attempt to improve audio issue in #4669