RFR: 8297872: Non-local G1MonotonicArenaFreePool::_freelist_pool has non-trivial ctor/dtor

[Ivan Walulya]

Hi all,

Please review this change that removes the use of a static variable (G1MonotonicArenaFreePool::_freelist_pool) with a non-trivial non-trivial ctor and dtor.

Testing: Tier 1-3

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Commit messages:
 - cleanup
 - his - suggestd by thomas
 - fix static sizes
 - 8297872: Non-local G1MonotonicArenaFreePool::_freelist_pool has non-trivial ctor/dtor

Changes: https://git.openjdk.org/jdk/pull/11485/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11485&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297872
  Stats: 33 lines in 9 files changed: 13 ins; 8 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/11485.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11485/head:pull/11485

PR: https://git.openjdk.org/jdk/pull/11485