Integrated: 8358102: GenShen: Age tables could be seeded with cumulative values

[William Kemper]

When dynamic tenuring threshold is disabled, or the age census is configured to be computed during evacuation, the first cohort is seeded with the cumulative counts, rather than the current cycle's counts. This is not the default configuration so this is not an urgent issue.

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Commit messages:
 - Use census data from current cycle, rather than cumulative values

Changes: https://git.openjdk.org/jdk/pull/25535/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25535&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358102
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25535.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25535/head:pull/25535

PR: https://git.openjdk.org/jdk/pull/25535