[aarch64-port-dev ] RFR 8231841: AArch64: Add entry to pns output in help()

[Alan Hayward]

Please could you review this change which adds AArch64 to the pns section of the help() output.

Bug: https://bugs.openjdk.java.net/browse/JDK-8231841
Webrev: http://cr.openjdk.java.net/~smonteith/8231841/webrev.0/


Built and ran tier1 on x86 and AArch64.


Thanks,
Alan.