[jdk21u-dev] RFR: 8360664: Null pointer dereference in src/hotspot/share/prims/jvmtiTagMap.cpp in IterateOverHeapObjectClosure::do_object()

[Artem Semenov]

Hi all,

    This pull request contains a backport of commit [e9a43416](https://github.com/openjdk/jdk/commit/e9a434165a6ec07cde0429c7f9823bbc5dab7857) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

    The commit being backported was authored by Artem Semenov on 7 Jul 2025 and was reviewed by Serguei Spitsyn, Alex Menkov and Chris Plummer.

    Thanks!

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Commit messages:
 - Backport e9a434165a6ec07cde0429c7f9823bbc5dab7857

Changes: https://git.openjdk.org/jdk21u-dev/pull/1982/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1982&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8360664
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1982.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1982/head:pull/1982

PR: https://git.openjdk.org/jdk21u-dev/pull/1982