lockmgr: shrink struct lock by 8 bytes on LP64

Currently the struct has a 4 byte padding stemming from 3 ints.

1. prio comfortably fits in short, unfortunately there is no dedicated
   type for it and plumbing it throughout the codebase is not worth it
   right now, instead an assert is added which covers also flags for
   safety
2. lk_exslpfail can in principle exceed u_short, but the count is
   already not considered reliable and it only ever gets modified
   straight to 0. In other words it can be incrementing with an upper
   bound of USHRT_MAX

With these in place struct lock shrinks from 48 to 40 bytes.

Reviewed by:	kib (previous version)
Differential Revision:	https://reviews.freebsd.org/D28680

0 files changed, 0 insertions, 0 deletions