RFR: 8367451: GenShen: Remove the option to compute age census during evacuation

[William Kemper]

This experimental option has always defaulted to false. We are working on changes that will make it impractical to maintain this option. We also do not regularly test this configuration.

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Commit messages:
 - Remove the option to compute age census at evacuation

Changes: https://git.openjdk.org/jdk/pull/27236/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27236&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367451
  Stats: 18 lines in 7 files changed: 0 ins; 5 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/27236.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27236/head:pull/27236

PR: https://git.openjdk.org/jdk/pull/27236