Tidy up locking in cd9660_mount; thrash the lock less, and make it
clear that the lock is only dropped when calling iso_mountfs().

While here, don't use the vnode pointer's value after vrele().
Use sizeof(__int128_t) for aarch64 and sizeof(long long) for ARM EABI
fix date timestamp
PR port-luna68k/48677: fix some typos.
From shinnashi takeshi.
- Make VI_XLOCK, VI_CLEAN and VI_LOCKSHARE private to kern/vfs_*.c.
- Make vwait() static.
- Add  vdead_check() to check a vnode for being or becoming dead.

Discussed on tech-kern.

Welcome to 6.99.38
fix manual section numbering of sysctl.
  thanks wiz@
- remove unused
- use cpu_{g,s}etmodel() (not committed yet)
avoid dup defs, use global macros
avoid local redefinitions
- remove unused
- use cpu_{g,s}etmodel
- use cpu_{g,s}etmodel
- remove unused
- use cpu_{g,s}etmodel
- fix unused
- fix unused
- use cpu_{g,s}etmodel
remove dup cpu_model sysctl; use the mi version in hw.
use cpu_{g,s}etmodel
- remove unused
- use cpu_{g,s}etmodel
- use cpu_{g,s}etmodel
- fix unused
use cpu_{g,s}etmodel
fix unused
- use cpu_{g,s}etmodel
- fix unused
fix memset bugs