[jdk17u-dev] RFR: 8278627: Shenandoah: TestHeapDump test failed

[Zhengyu Gu]

I would like to backport this patch to 17u, it fixes a potential fatal crash during heap dump.

The original patch does not apply cleanly, due to context differences, e.g. JDK-8277342 and JDK-8268368 do not in 17u.

Test:
- [x] hotspot_gc_shenandoah

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Commit messages:
 - Backport 1128674d7f3766dda8869b213e1fc629e44ea7a8

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/58/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=58&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278627
  Stats: 45 lines in 3 files changed: 22 ins; 6 del; 17 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/58.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/58/head:pull/58

PR: https://git.openjdk.java.net/jdk17u-dev/pull/58