RFR: JDK-8328786: [AIX] move some important warnings/errors from trcVerbose to UL

[Matthias Baesken]

trcVerbose is a macro that can be used in the AIX OpenJDK codebase.
It boils down to `if (Verbose) { <print message> } ;`
However this means that it can only be used in non product JVM because Verbose is a develop flag.
So more important warning/error/info messages should better be moved e.g. to UL so that they are usable in product JVMs too,

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Commit messages:
 - adjust COPYRIGHT years
 - JDK-8328786

Changes: https://git.openjdk.org/jdk/pull/18517/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18517&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328786
  Stats: 29 lines in 3 files changed: 2 ins; 1 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/18517.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18517/head:pull/18517

PR: https://git.openjdk.org/jdk/pull/18517