RFR: 8280783: Parallel: Refactor PSCardTable::scavenge_contents_parallel

[Thomas Schatzl]

On Thu, 27 Jan 2022 08:49:47 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> A new version of `PSCardTable::scavenge_contents_parallel` with cleaner structure and most of the existing behavior. The deviation is so large that the diff is not very sensible; reading the new code directly is probably easier.
> 
> This PR doesn't take advantage of precise card marking, just like the existing code. IOW, the code assumes all cards are *imprecisely* marked. Optimizations like utilizing precise card marking will be investigated/attempted in another ticket/PR.
> 
> Test: Tier1-6

Lgtm.

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Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/7243