RFR: 8337267: [REDO] G1: Refactor G1RebuildRSAndScrubTask

[Albert Mingkun Yang]

On Fri, 26 Jul 2024 10:09:52 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> The first commit is the original and the second commit fixes the issue, `should_rebuild_or_scrub` should be unconditional because `yield_if_necessary` is called on two diff levels, per-obj and per-obj-chunk. `yield_if_necessary` should return the same value for the same region in two consecutive invocations.
> 
> Test: tier1-6, 500 successful runs of gc/logging/TestUnifiedLoggingSwitchStress.java, with 4/100 failing rate without the second commit.

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/20348#issuecomment-2255802579