[jdk11u-dev] RFR: 8231595: [TEST] develop a test case for SuspendThreadList including current thread

[Goetz Lindenmaier]

I backport this for parity with 11.0.19-oracle.

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Commit messages:
 - Backport 40918999947d6763d3f6d592bcdf828503217901

Changes: https://git.openjdk.org/jdk11u-dev/pull/1730/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1730&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8231595
  Stats: 431 lines in 2 files changed: 431 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1730.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1730/head:pull/1730

PR: https://git.openjdk.org/jdk11u-dev/pull/1730