RFR: 8333151: Investigate if the Hotspot Arena chunk pools still make sense [v2]

[Afshin Zafari]

> Using `ChunkPool` or not is investigated in this PR based on time and memory consumption.
> Based on the tests using ChunkPool shows no better speed nor memory footprint.
> Memory usage is taken from RSS reports of Linux API.

Afshin Zafari has updated the pull request incrementally with one additional commit since the last revision:

  fixes after merge glitches

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/20411/files
  - new: https://git.openjdk.org/jdk/pull/20411/files/081cf0a2..dc6be286

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20411&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20411&range=00-01

  Stats: 8 lines in 2 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/20411.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20411/head:pull/20411

PR: https://git.openjdk.org/jdk/pull/20411