[jdk21u-dev] RFR: 8331771: ZGC: Remove OopMapCacheAlloc_lock ordering workaround [v2]

[Xiaolong Peng]

> I'd like to backport [JDK-8331771](https://bugs.openjdk.org/browse/JDK-8331771) to jdk21

Xiaolong Peng has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge branch 'master' into backport
 - Backport 5746137e8a46e1eb964fe8c4de015a62dc17a745

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Changes: https://git.openjdk.org/jdk21u-dev/pull/626/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=626&range=01
  Stats: 22 lines in 4 files changed: 0 ins; 22 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/626.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/626/head:pull/626

PR: https://git.openjdk.org/jdk21u-dev/pull/626