RFR(S): 8176298: Log tags in -Xlog:help not sorted

[Marcus Larsson]

Hi,

Please review the following patch to keep log tags sorted when listed.

Issue:
https://bugs.openjdk.java.net/browse/JDK-8176298

Webrev:
http://cr.openjdk.java.net/~mlarsson/8176298/webrev.00

Verified with new unit test.

Thanks,
Marcus