[jdk21u-dev] RFR: 8299790: os::print_hex_dump is racy

[Thomas Stuefe]

Hi all,

This pull request contains a backport of commit [8f28809a](https://github.com/openjdk/jdk/commit/8f28809aa87b1026cdbdd1ea88da3c7f0c994697) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Thomas Stuefe on 10 Aug 2023 and was reviewed by Aleksey Shipilev and David Holmes.

Thanks!

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Commit messages:
 - Backport 8f28809aa87b1026cdbdd1ea88da3c7f0c994697

Changes: https://git.openjdk.org/jdk21u-dev/pull/824/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=824&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299790
  Stats: 72 lines in 2 files changed: 45 ins; 4 del; 23 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/824.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/824/head:pull/824

PR: https://git.openjdk.org/jdk21u-dev/pull/824