RFR: 8328307: GenShen: Re-enable old-has-grown trigger for old-generation GC [v2]

[Kelvin Nilsen]

> Reviewed-by: wkemper, ysr
> 
> This pull request contains a backport of commit bfb798a6 from the openjdk/shenandoah repository.
> 
> The commit being backported was authored by Kelvin Nilsen on 29 Apr 2024 and was reviewed by William Kemper and
> Y. Srinivas Ramakrishna.

Kelvin Nilsen has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge branch 'master' of https://git.openjdk.org/shenandoah-jdk21u into backport-kdnilsen-bfb798a6
 - 8328307: GenShen: Re-enable old-has-grown trigger for old-generation GC
   
   Reviewed-by: wkemper, ysr

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

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/41/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=41&range=01
  Stats: 268 lines in 6 files changed: 199 ins; 57 del; 12 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/41.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/41/head:pull/41

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/41