RFR: 8324995: Shenandoah: Skip to full gc for humongous allocation failures [v2]

[William Kemper]

> Shenandoah degenerated cycles do not compact regions. When a humongous allocation fails, it is likely due to fragmentation which is better addressed by a full gc.

William Kemper has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge branch 'openjdk-master' into humongous-alloc-failure-handling
 - Skip to full gc when humongous allocations fails

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Changes: https://git.openjdk.org/jdk/pull/17638/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17638&range=01
  Stats: 31 lines in 2 files changed: 16 ins; 0 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/17638.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17638/head:pull/17638

PR: https://git.openjdk.org/jdk/pull/17638