[jdk17u-dev] RFR: 8274687: JDWP deadlocks if some Java thread reaches wait in blockOnDebuggerSuspend

[Richard Reingruber]

Hi all,

This pull request contains a backport of commit [ca2efb73](https://github.com/openjdk/jdk/commit/ca2efb73f59112d9be2ec29db405deb4c58dd435) from the [openjdk/jdk](https://git.openjdk.java.net/jdk) repository.

The commit being backported was authored by Richard Reingruber on 15 Nov 2021 and was reviewed by Chris Plummer, Serguei Spitsyn and Ralf Schmelter.

Thanks!
Richard.

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Commit messages:
 - Backport ca2efb73f59112d9be2ec29db405deb4c58dd435

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/375/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=375&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274687
  Stats: 333 lines in 2 files changed: 314 ins; 14 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/375.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/375/head:pull/375

PR: https://git.openjdk.java.net/jdk17u-dev/pull/375