RFR: 8356173: Remove ThreadCritical [v5]

[Coleen Phillimore]

> Updated the description in the bug.  This removes the last use of ThreadCritical and replaces it with a global PlatformMutex lock.
> Tested with tier1-4, and tier1 on all Oracle-supported OSs.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Use Camel case for global lock variable.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25072/files
  - new: https://git.openjdk.org/jdk/pull/25072/files/a7b2999c..4bafde3b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25072&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25072&range=03-04

  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/25072.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25072/head:pull/25072

PR: https://git.openjdk.org/jdk/pull/25072