RFR: 8316632: Shenandoah: Raise OOME when gc threshold is exceeded

[William Kemper]

Shenandoah will run back-to-back full GCs and _almost_ grind mutator progress to a halt before eventually exhausting memory. This change will have Shenandoah raise a gc threshold exceeded exception if the collector fails to make progress after `ShenandoahNoProgressThreshold` full GC cycles (default is 3).

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Commit messages:
 - Fix 32-bit build error
 - Do not use atomics in header
 - Signal gc threshold exceeded when appropriate

Changes: https://git.openjdk.org/jdk/pull/15852/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15852&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316632
  Stats: 55 lines in 6 files changed: 42 ins; 3 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/15852.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15852/head:pull/15852

PR: https://git.openjdk.org/jdk/pull/15852