wrappers around the speicificdata subroutines. Also:
- Call the new lwpinit() function from main() after calling procinit().
- Move some pool initialization out of kern_proc.c and into files that
are directly related to the pools in question (kern_lwp.c and kern_ras.c).
- Convert uipc_sem.c to proc_{get,set}specific(), and eliminate the p_ksems
member from struct proc.
Remove p_raslock and rename p_lwplock p_lock (one lock is enough).
Simplify window test when adding a ras and correct test on VM_MAXUSER_ADDRESS.
Avoid unpredictable branch in i386 locore.S
(pad fields left in struct proc to avoid kernel bump)
