RFR: 8373100: Genshen: Control thread can miss allocation failure notification [v2]

[William Kemper]

> In some cases, the control thread may fail to observe an allocation failure. This results in the thread which failed to allocate waiting forever for the control thread to run a cycle. Depending on which thread fails to allocate, the process may not make progress.

William Kemper has updated the pull request incrementally with one additional commit since the last revision:

  Set requested gc cause under a lock when allocation fails

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28665/files
  - new: https://git.openjdk.org/jdk/pull/28665/files/89af1701..1081f21e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28665&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28665&range=00-01

  Stats: 27 lines in 2 files changed: 2 ins; 8 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/28665.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28665/head:pull/28665

PR: https://git.openjdk.org/jdk/pull/28665