RFR: 8364722: Parallel: Move CLDG mark clearing to the end of full GC

[Albert Mingkun Yang]

Move ClassLoaderDataGraph claim-mark clearing to `post_compact` (the end of full-gc), to be more aligned with other GCs.

Test: tier1-3

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Commit messages:
 - pgc-reset-claim

Changes: https://git.openjdk.org/jdk/pull/26637/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26637&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364722
  Stats: 6 lines in 1 file changed: 3 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26637.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26637/head:pull/26637

PR: https://git.openjdk.org/jdk/pull/26637