RFR: 8321401: GenShen: Each mutator must see FullGC before throwing OOM [v2]

[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:

  Fixup comment

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Changes:
  - all: https://git.openjdk.org/shenandoah/pull/365/files
  - new: https://git.openjdk.org/shenandoah/pull/365/files/92b814f3..6d6f16db

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=shenandoah&pr=365&range=01
 - incr: https://webrevs.openjdk.org/?repo=shenandoah&pr=365&range=00-01

  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/shenandoah/pull/365.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/365/head:pull/365

PR: https://git.openjdk.org/shenandoah/pull/365