RFR: 8365956: GenShen: Adaptive tenuring threshold algorithm may raise threshold prematurely [v4]

[William Kemper]

> The adaptive tenuring algorithm has been modified to begin its evaluation of mortality rates from the current tenuring threshold. To compliment this change, objects must also now be strictly above the tenuring threshold to be promoted (instead of greater-than-or-equal).

William Kemper has updated the pull request incrementally with one additional commit since the last revision:

  Be consistent when comparing tenuring threshold with ages

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26906/files
  - new: https://git.openjdk.org/jdk/pull/26906/files/b9e16d26..658f76f7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26906&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26906&range=02-03

  Stats: 84 lines in 12 files changed: 42 ins; 20 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/26906.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26906/head:pull/26906

PR: https://git.openjdk.org/jdk/pull/26906