[jdk21u-dev] RFR: 8330275: Crash in XMark::follow_array

[Ashutosh Mehra]

Backport of [JDK-8330275](https://bugs.openjdk.org/browse/JDK-8330275) to fix crash in ZGC.

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Commit messages:
 - Backport 42b1d858d15fd06de9ce41b08b430b12724652e9

Changes: https://git.openjdk.org/jdk21u-dev/pull/612/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=612&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330275
  Stats: 10 lines in 2 files changed: 4 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/612.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/612/head:pull/612

PR: https://git.openjdk.org/jdk21u-dev/pull/612