PP mutexes: lock: Reduce 'umtx_lock' holding before taking the user lock

[olce]

Summary

There is no need to have it for the priority check (that the thread
doesn't have a higher priority than the mutex's ceiling), and there's
also no need to take it if the thread doesn't have privileges to set its
priority to the mutex's ceiling.

While here, turn 'su' into a 'bool' and compute the internal priority
corresponding to the mutex's ceiling once and for all, putting it in new
'new_pri'.

[kib]

Trying to coalesce other umtx_lock-ed regions in this loop (and after it) might be even more useful.