[jdk11u-dev] RFR: 8218483: Crash in "assert(_daemon_threads_count->get_value() > daemon_count) failed: thread count mismatch 5 : 5"

[Christoph Langer]

Backport of JDK-8218483. Hotspot changes apply clean. Changes to gtest threadHelper.inline.hpp needed to be performed in utilitiesHelper.inline.hpp.

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Commit messages:
 - Backport 2f20909d10ae33d93d62f5dcd4915efdbd83d968

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/326/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=326&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8218483
  Stats: 18 lines in 4 files changed: 4 ins; 3 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/326.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/326/head:pull/326

PR: https://git.openjdk.java.net/jdk11u-dev/pull/326