use sched_is_idle() and nuke the sched_chooseproc prototype since we
already have on in sched.h

Move the implementation of __mp_lock (biglock) into machine dependent
code. At this moment all architectures get the copy of the old code
except i386 which gets a new shiny implementation that doesn'

Move the implementation of __mp_lock (biglock) into machine dependent
code. At this moment all architectures get the copy of the old code
except i386 which gets a new shiny implementation that doesn't spin
at splhigh (doh!) and doesn't try to grab the biglock when releasing
the biglock (double doh!).

Shaves 10% of system time during kernel compile and might solve a few
bugs as a bonus.

Other architectures coming shortly.

miod@ deraadt@ ok

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Make context switching much more MI:
- Move the functionality of choosing a process from cpu_switch into
a much simpler function: cpu_switchto. Instead of having the locore
code walk the run q

Make context switching much more MI:
- Move the functionality of choosing a process from cpu_switch into
a much simpler function: cpu_switchto. Instead of having the locore
code walk the run queues, let the MI code choose the process we
want to run and only implement the context switching itself in MD
code.
- Let MD context switching run without worrying about spls or locks.
- Instead of having the idle loop implemented with special contexts
in MD code, implement one idle proc for each cpu. make the idle
loop MI with MD hooks.
- Change the proc lists from the old style vax queues to TAILQs.
- Change the sleep queue from vax queues to TAILQs. This makes
wakeup() go from O(n^2) to O(n)

there will be some MD fallout, but it will be fixed shortly.
There's also a few cleanups to be done after this.

deraadt@, kettenis@ ok

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