RFR: 8369814: G1: Relax card mark and store ordering [v3]

[Albert Mingkun Yang]

> This PR removes the card-mark and store ordering constraint. The first commit changes `card_mark_must_follow_store` to `false` and the second commit removes all uses of `card_mark_must_follow_store`, because both the original method and its override are identical, and no GC have such ordering requirement any more.
> 
> Test: tier1-5

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/27794/files
  - new: https://git.openjdk.org/jdk/pull/27794/files/1eed131b..a54bc3b6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27794&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27794&range=01-02

  Stats: 12 lines in 2 files changed: 0 ins; 11 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27794.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27794/head:pull/27794

PR: https://git.openjdk.org/jdk/pull/27794