K 10
svn:author
V 8
jhibbits
K 8
svn:date
V 27
2014-09-05T05:07:38.021869Z
K 7
svn:log
V 362
MFC r258078,258079

Increase the stack size for ppc64 from 4 pages to 8.

I found a stack overflow when a coredump was taken onto a ZFS volume with
heavy network activity.  2 DSI traps, plus one DECR trap, along with several
function calls in the stack, overflowed the 4 pages.  8 page stack fixes this.

Discussed with: nwhitehorn
Approved by:	re
Relnotes:	yes

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