RFR: 8264489: Add more logging to LargeCopyWithMark.java

[Stefan Karlsson]

Add more logging to the LargeCopyWithMark.java test, to gather more information when this test fails with OOME. 

The intention is to gather more info for JDK-8239089.

I consider this patch trivial, and expect to push it after I've gotten on Review.

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Commit messages:
 - 8264489: Add more logging to LargeCopyWithMark.java

Changes: https://git.openjdk.java.net/jdk/pull/3282/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3282&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264489
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3282.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3282/head:pull/3282

PR: https://git.openjdk.java.net/jdk/pull/3282