[tor-bugs] #28981 [Core Tor]: Use HW_PHYSMEM in get_total_system_memory_impl

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#28981: Use HW_PHYSMEM in get_total_system_memory_impl
--------------------+--------------------------
 Reporter:  kjak    |          Owner:  (none)
     Type:  defect  |         Status:  new
 Priority:  Medium  |      Component:  Core Tor
  Version:          |       Severity:  Normal
 Keywords:          |  Actual Points:
Parent ID:          |         Points:
 Reviewer:          |        Sponsor:
--------------------+--------------------------
 An upcoming PR will change `get_total_system_memory_impl` to use
 `HW_PHYSMEM` instead of `HW_USERMEM` in the case where `HW_PHYSMEM` is
 defined but some other methods are not available for getting the total
 physical memory (one example: FreeBSD).

 The code actually checks that `HW_PHYSMEM` is defined, and comments
 reference `HW_PHYSMEM`, but `HW_USERMEM` is simply used instead.

 For OpenBSD, NetBSD and OSX a 64-bit variant of `HW_PHYSMEM` is used when
 available.

 The same PR will also contain a commit to update/fix a couple of comments
 in this same file.  It will fix a typo in a comment and update another
 comment which suggests that `HW_PHYSMEM64` is something only on OpenBSD
 when NetBSD actually defines it as well.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28981>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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