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

[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.

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Commit messages:
 - 8328307: GenShen: Re-enable old-has-grown trigger for old-generation GC

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/41/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=41&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328307
  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