[jdk21u-dev] RFR: 8333887: ubsan: unsafe.cpp:247:13: runtime error: store to null pointer of type 'volatile int' [v5]

[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！

luwang1103 has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  adjust indentation

-------------

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/837/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/837/files/771502b4..ec5c7442

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=837&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=837&range=03-04

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 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