Commit 5/14 of sched_lock decomposition.

 - Protect the cp_time tick counts with atomics instead of a global lock.
   There will only be one atomic per tick and this allows all processors
   to execute softclock concurrently.
 - In softclock, protect access to rusage and td_*tick data with the
   thread_lock(), expanding the scope of the thread lock over the whole
   function.
 - Do some creative re-arranging in hardclock() to avoid excess locking.
 - Protect the p_timer fields with the per-process spinlock.

Tested by:      kris, current@
Tested on:      i386, amd64, ULE, 4BSD, libthr, libkse, PREEMPTION, etc.
Discussed with: kris, attilio, kmacy, jhb, julian, bde (small parts each)

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