RFR: 8255196: Remove unused G1FullGCCompactionPoint::merge()

[Thomas Schatzl]

Hi all,

  please review this trivial(?) removal of an unused method.

Test: local compilation

Thanks,
  Thomas

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Commit messages:
 - Initial import

Changes: https://git.openjdk.java.net/jdk/pull/798/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=798&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255196
  Stats: 5 lines in 2 files changed: 0 ins; 5 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/798.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/798/head:pull/798

PR: https://git.openjdk.java.net/jdk/pull/798