RFR: 8253397: Ensure LogTag types are sorted [v2]

[Claes Redestad]

> - Sort LogTag type enum alphabetically
> - Assert that the tags are sorted instead of sorting

Claes Redestad has updated the pull request with a new target base due to a merge or a rebase. The pull request now
contains two commits:

 - Make LogTag::_name const
 - Ensure LogTag types are sorted

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Changes: https://git.openjdk.java.net/jdk/pull/274/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=274&range=01
  Stats: 60 lines in 2 files changed: 24 ins; 22 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/274.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/274/head:pull/274

PR: https://git.openjdk.java.net/jdk/pull/274