K 10
svn:author
V 8
vangyzen
K 8
svn:date
V 27
2017-06-01T16:03:01.857352Z
K 7
svn:log
V 211
MFC r318582

Remove old spinlock_debug code from libc

This no longer seems useful.  Remove it.

This was prompted by a "cast discards volatile qualifier" warning
in libthr when WARNS=6.

Sponsored by:	Dell EMC

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