RFR: 8355743: G1: Collection set clearing is not recorded as part of "Free Collection Set Time"

[Thomas Schatzl]

Hi all,

  please review this change that moves "clear_collection_set" work correctly under the "Serial Free Collection Set" phase.

There is probably no particular impact on timings, but just for correctness.

Testing: gha, gc/g1 tests

Thanks,
  Thomas

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Commit messages:
 - 8355743

Changes: https://git.openjdk.org/jdk/pull/25222/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25222&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8355743
  Stats: 4 lines in 1 file changed: 2 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25222.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25222/head:pull/25222

PR: https://git.openjdk.org/jdk/pull/25222