RFR: 8267834: Refactor G1CardSetAllocator and BufferNode::Allocator to use a common base class

[Ivan Walulya]

Hi all,

Please review this change to combine free list allocation used in G1CardSetAllocator and BufferNode::Allocator into a single class. 

Testing: Tier 1-5

Thanks
Ivan

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Commit messages:
 - 8267834: Refactor G1CardSetAllocator and BufferNode::Allocator to use a common base class

Changes: https://git.openjdk.java.net/jdk/pull/7615/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7615&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267834
  Stats: 717 lines in 10 files changed: 390 ins; 281 del; 46 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7615.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7615/head:pull/7615

PR: https://git.openjdk.java.net/jdk/pull/7615