[jdk21u-dev] RFR: 8335493: check_gc_overhead_limit should reset SoftRefPolicy::_should_clear_all_soft_refs

[Liang Mao]

Clean backport of fixing soft-ref resetting in Parallel Full GC.

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Commit messages:
 - Backport cff9e246cc2fbd3914f40bb71daa85dcf7731396

Changes: https://git.openjdk.org/jdk21u-dev/pull/857/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=857&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335493
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/857.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/857/head:pull/857

PR: https://git.openjdk.org/jdk21u-dev/pull/857