RFR: 8348978: Regression ~8% on J2dBench-vimg_text_aa-ParGC only on linux aarch64 [v2]

[Per Minborg]

> This PR proposes to use an anonymous class rather than a lambda in order to improve startup time.
> 
> We need to make sure the regression is fixed by this. It might be the case that the regression is there because [JDK-8347047](https://bugs.openjdk.org/browse/JDK-8347047) actually fixed an issue so that the segments could be collected by the GC.

Per Minborg has updated the pull request incrementally with one additional commit since the last revision:

  Add comment on anonymous class

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/24514/files
  - new: https://git.openjdk.org/jdk/pull/24514/files/98975dc9..49c4b352

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24514&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24514&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24514.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24514/head:pull/24514

PR: https://git.openjdk.org/jdk/pull/24514