RFR: 8269870: PS: Membar in PSPromotionManager::copy_unmarked_to_survivor_space could be relaxed [v3]

[Albert Mingkun Yang]

> The acquire-release mem-barrier was probably used/required before but not any more. Inspiration taken from `G1ParScanThreadState::do_oop_evac`.

Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:

  review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19764/files
  - new: https://git.openjdk.org/jdk/pull/19764/files/fb4a255a..58e38079

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19764&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19764&range=01-02

  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19764.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19764/head:pull/19764

PR: https://git.openjdk.org/jdk/pull/19764