[jdk21u-dev] RFR: 8351593: [JMH] test PhoneCode.Bulk reports NPE exception

[SendaoYan]

Hi all,

This pull request contains a backport of commit [50ac24eb](https://github.com/openjdk/jdk/commit/50ac24eb0ff06d9b4fc52a6cafea63eb4d59cb95) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Vladimir Ivanov on 27 Mar 2025 and was reviewed by Claes Redestad and Derek White.

Thanks!

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Commit messages:
 - Backport 50ac24eb0ff06d9b4fc52a6cafea63eb4d59cb95

Changes: https://git.openjdk.org/jdk21u-dev/pull/1914/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1914&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351593
  Stats: 749 lines in 7 files changed: 0 ins; 749 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1914.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1914/head:pull/1914

PR: https://git.openjdk.org/jdk21u-dev/pull/1914