RFR: 8245107: Use Unified Logging in trace_method_handle_stub()

[Christian Hagedorn]

This changes the logging of method handles from specifying Verbose to using unified logging with level Trace.

I only tested it on x86. Could anybody verify that it also works on ARM, S390 and PPC?

Thanks,
Christian

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Commit messages:
 - 8245107: Use Unified Logging in trace_method_handle_stub()

Changes: https://git.openjdk.java.net/jdk/pull/1665/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1665&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8245107
  Stats: 73 lines in 6 files changed: 16 ins; 3 del; 54 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1665.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1665/head:pull/1665

PR: https://git.openjdk.java.net/jdk/pull/1665