RFR: 8282089: [REDO] Parallel: Refactor PSCardTable::scavenge_contents_parallel

Tue Feb 22 12:06:10 UTC 2022

Mostly the same as [JDK-8280783](https://bugs.openjdk.java.net/browse/JDK-8280783), except one assertion is weakened.

assert(*dirty_r == clean_card || dirty_r >= clear_limit_r);

Test: tier1-6
I also tried to reproduce the failures in https://bugs.openjdk.java.net/browse/JDK-8282062, but to no avail.

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Commit messages:
 - 8282089: [REDO] Parallel: Refactor PSCardTable::scavenge_contents_parallel"

Changes: https://git.openjdk.java.net/jdk/pull/7573/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7573&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282089
  Stats: 277 lines in 2 files changed: 103 ins; 101 del; 73 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7573.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7573/head:pull/7573

PR: https://git.openjdk.java.net/jdk/pull/7573