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

[Xiaolong Peng]

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

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Commit messages:
 - Backport 5746137e8a46e1eb964fe8c4de015a62dc17a745

Changes: https://git.openjdk.org/jdk21u-dev/pull/626/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=626&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331771
  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