RFR: 8309960: ParallelGC young collections very slow in DelayInducer

[Albert Mingkun Yang]

Using the benchmark from the JBS ticket, one can observe the young-gc-pause regression is gone.

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Commit messages:
 - pgc-overflow-queue

Changes: https://git.openjdk.org/jdk/pull/14469/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14469&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309960
  Stats: 9 lines in 1 file changed: 6 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/14469.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14469/head:pull/14469

PR: https://git.openjdk.org/jdk/pull/14469