[jdk17u-dev] RFR: 8283670: gtest os.release_multi_mappings_vm is still racy

[Goetz Lindenmaier]

A nice to have test improvement. Clean.

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Commit messages:
 - Backport 2e9fd56524f739dc4023b81061cb2587d6325fac

Changes: https://git.openjdk.org/jdk17u-dev/pull/1798/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1798&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8283670
  Stats: 42 lines in 1 file changed: 18 ins; 8 del; 16 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1798.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1798/head:pull/1798

PR: https://git.openjdk.org/jdk17u-dev/pull/1798