RFR: 8252868: Clean up unused function from G1MMUTracker

Mon Sep 7 14:09:53 UTC 2020

Please review this cleanup to remove a few unused functions from the G1MMUTracker interface.

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Commit messages:
 - Updated comment
 - 8252868: Clean up unused function from G1MMUTracker

Changes: https://git.openjdk.java.net/jdk/pull/58/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=58&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252868
  Stats: 15 lines in 2 files changed: 0 ins; 14 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/58.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/58/head:pull/58

PR: https://git.openjdk.java.net/jdk/pull/58