MFC r253094:
Use MSI for xhci(4), if supported.

Approved by:	re (delphij)
MFC r253075: namecache sdt: freebsd doesn't support structured
characters yet

Approved by:	re (kib)
MFC r253078: audit_proc_coredump: check return value of audit_new

Approved by:	re (kib)
MFC r253079: dtrace/fasttrap: install hook functions only after all data
is initialized

Approved by:	re (marius)
Merge remote-tracking branch 'upstream-github/stable/9' into stable/9