RFR(XS): [TESTBUG] Fix runtime/StackGuardPages/testme.sh to deal with 64k pages.

[Lindenmaier, Goetz]

Hi,

runtime/StackGuardPages/testme.sh fails on OSes with default 64K pages.
This happens on ppc linux distributions. The test passes -Xss320k to the VM.

Fix: increase to -Xss328K.

Please review this change of a single character ;) I please need a sponsor.
http://cr.openjdk.java.net/~goetz/webrevs/8078595-64Kpages/webrev.01/

Best regards,
  Goetz.