[jdk17u-dev] RFR: 8288556: VM crashes if it gets sent SIGUSR2 from outside

[Goetz Lindenmaier]

I backport this for parity with 17.0.19-oracle.

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Commit messages:
 - Backport 701ea3beaaef1acda2d2e041cfdb7d75549cf95c

Changes: https://git.openjdk.org/jdk17u-dev/pull/4217/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=4217&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288556
  Stats: 16 lines in 1 file changed: 15 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/4217.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/4217/head:pull/4217

PR: https://git.openjdk.org/jdk17u-dev/pull/4217