[jdk25u] RFR: 8365956: GenShen: Adaptive tenuring threshold algorithm may raise threshold prematurely

[William Kemper]

Not clean, but not especially difficult to resolve.

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

Changes: https://git.openjdk.org/jdk25u/pull/198/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=198&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365956
  Stats: 348 lines in 15 files changed: 254 ins; 29 del; 65 mod
  Patch: https://git.openjdk.org/jdk25u/pull/198.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/198/head:pull/198

PR: https://git.openjdk.org/jdk25u/pull/198