RFR: 8277904: G1: Remove G1CardSetArray::max_entries

[Hamlin Li]

Trivial change of removing dead code.

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Commit messages:
 - typo
 - typo
 - Initial commit

Changes: https://git.openjdk.java.net/jdk/pull/6587/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6587&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277904
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6587.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6587/head:pull/6587

PR: https://git.openjdk.java.net/jdk/pull/6587