splstatclock, spllock -> splhigh

Correct comment.

lockdebug_abort: s/int/u_int/ for lock id as the rest of code.

lockdebug:

- Initialize on the first allocation.
- Handle overflow better. PR kern/35723.

TRUE -> true, FALSE -> false

Pick up some additional files that were missed before due to conflicts
with newlock2 merge:

Replace the Mach-derived boolean_t type with the C99 bool type. A
future commit will replace use of TRUE

Pick up some additional files that were missed before due to conflicts
with newlock2 merge:

Replace the Mach-derived boolean_t type with the C99 bool type. A
future commit will replace use of TRUE and FALSE with true and false.

show more ...

Merge newlock2 to head.