[jdk21u-dev] RFR: 8333887: ubsan: unsafe.cpp:247:13: runtime error: store to null pointer of type 'volatile int'

[luwang1103]

hi @shipilev ,

This pull request contains a backport of commit [0d3a3771](https://git.openjdk.org/jdk/commit/0d3a3771c3777d3dd1fec8dc8faed5fd02b06830) from the [master](https://github.com/openjdk/jdk) repository.

The commit being backported was authored by Matthias Baesken on 13 Jun 2024.

Thanks！

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Commit messages:
 - Backport 0d3a3771c3777d3dd1fec8dc8faed5fd02b06830

Changes: https://git.openjdk.org/jdk21u-dev/pull/837/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=837&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333887
  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/837.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/837/head:pull/837

PR: https://git.openjdk.org/jdk21u-dev/pull/837