K 10
svn:author
V 6
rlibby
K 8
svn:date
V 27
2017-07-21T17:11:36.708925Z
K 7
svn:log
V 436
__pcpu: gcc -Wredundant-decls

Pollution from counter.h made __pcpu visible in amd64/pmap.c.  Delete
the existing extern decl of __pcpu in amd64/pmap.c and avoid referring
to that symbol, instead accessing the pcpu region via PCPU_SET macros.
Also delete an unused extern decl of __pcpu from mp_x86.c.

Reviewed by:	kib
Approved by:	markj (mentor)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D11666

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