RFR: 8287089: G1CollectedHeap::is_in_cset() can be const methods

[Thomas Schatzl]

Hi all,

  please review making the various `G1CollectedHeap::is_in_cset()` methods const methods.

Testing: local compilation

Thanks,
  Thomas

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Commit messages:
 - 8287089: G1CollectedHeap::is_in_cset() can be const methods

Changes: https://git.openjdk.java.net/jdk/pull/8836/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8836&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287089
  Stats: 6 lines in 2 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8836.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8836/head:pull/8836

PR: https://git.openjdk.java.net/jdk/pull/8836