RFR: 8365956: GenShen: Adaptive tenuring threshold algorithm may raise threshold prematurely

[William Kemper]

Not clean. Conflicts were because of format specifiers for the most part.

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

Commit messages:
 - 8365956: GenShen: Adaptive tenuring threshold algorithm may raise threshold prematurely

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/221/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=221&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365956
  Stats: 348 lines in 15 files changed: 255 ins; 30 del; 63 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/221.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/221/head:pull/221

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/221