K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2017-08-22T00:10:15.769968Z
K 7
svn:log
V 675
subr_smp: Clean up topology analysis, add additional layers

Rather than repeatedly nesting loops, separate concerns with a single loop
per call stack level.  Use a table to drive the recursive routine.  Handle
missing topology layers more gracefully (infer a single unit).

Analyze some additional optional layers which may be present on e.g. AMD Zen
systems (groups, aka dies, per package; and cachegroups, aka CCXes, per
group).

Display that additional information in the boot-time topology information,
when it is relevent (non-one).

Reviewed by:	markj@, mjoras@ (earlier version)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D12019

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