RFR: 8343726: [BACKOUT] NMT should not use ThreadCritical

[Johan Sjölen]

Hi,

We've unfortunately seen a few bugs and crashes related to this PR, so let's back it out.

Thanks.

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Commit messages:
 - Revert "8304824: NMT should not use ThreadCritical"

Changes: https://git.openjdk.org/jdk/pull/21937/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21937&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343726
  Stats: 62 lines in 15 files changed: 21 ins; 19 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/21937.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21937/head:pull/21937

PR: https://git.openjdk.org/jdk/pull/21937