[jdk11u-dev] RFR: 8262379: Add regression test for JDK-8257746 [v2]

[Jonathan Dowland]

> Backport of [JDK-8262379](https://bugs.openjdk.java.net/browse/JDK-8262379) (Add regression test for JDK-8257746) for jdk11u-dev. Depends on #1020 . The added test passes for me (cgroups v2 system).

Jonathan Dowland has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.java.net/jdk11u-dev/pull/1066/files
  - new: https://git.openjdk.java.net/jdk11u-dev/pull/1066/files/c9307887..c9307887

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1066&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1066&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/1066.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/1066/head:pull/1066

PR: https://git.openjdk.java.net/jdk11u-dev/pull/1066