K 10
svn:author
V 3
gnn
K 8
svn:date
V 27
2012-04-02T20:10:50.820481Z
K 7
svn:log
V 196
MFC: 232612

Properly mask off bits that are not supported in the IAP counters.
This fixes a bug where users would see massively large counts, near
to 2**64 -1, due to the bits not being cleared.

END