RFR: 8321401: Shenandoah: Each mutator must see FullGC before throwing OOM [v3]

[Kelvin Nilsen]

> Require each thread to observe unproductive Full GC before it throws OOM exception.

Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:

  Fix several bugs for GCU limit exceeded implementation

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16985/files
  - new: https://git.openjdk.org/jdk/pull/16985/files/c80c049e..89aa26fe

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16985&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16985&range=01-02

  Stats: 32 lines in 3 files changed: 23 ins; 3 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/16985.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16985/head:pull/16985

PR: https://git.openjdk.org/jdk/pull/16985