RFR: 8292654: G1 remembered set memory footprint regression after JDK-8286115

[Thomas Schatzl]

Hi all,

  can I have reviews for this change that reverts [JDK-8286115](https://bugs.openjdk.org/browse/JDK-8286115) to get back remset memory footprint to previous levels?

Testing: local remset size testing

Thanks,
  Thomas

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Commit messages:
 - initial version

Changes: https://git.openjdk.org/jdk/pull/9966/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9966&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292654
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9966.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9966/head:pull/9966

PR: https://git.openjdk.org/jdk/pull/9966