K 10
svn:author
V 8
jhibbits
K 8
svn:date
V 27
2019-07-25T03:47:27.215118Z
K 7
svn:log
V 427
powerpc/pmap64: Make moea64 statistics optional

Summary:
It turns out statistics accounting is very expensive in the pmap driver,
and doesn't seem necessary in the common case.  Make this optional
behind a MOEA64_STATS #define, which one can set if they really need
statistics.

This saves ~7-8% on buildworld time on a POWER9.

Found by bdragon.

Reviewed by:	luporl
Differential Revision: https://reviews.freebsd.org/D20903

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