RFR: 8259845: Move placeholder implementation details to cpp file and add logging

[Coleen Phillimore]

See CR for details.
Tested with tier1-3 and manually by looking at the output.

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Commit messages:
 - 8259845: Move placeholder implementation details to cpp file and add logging

Changes: https://git.openjdk.java.net/jdk/pull/2204/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2204&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259845
  Stats: 316 lines in 3 files changed: 175 ins; 130 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2204.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2204/head:pull/2204

PR: https://git.openjdk.java.net/jdk/pull/2204