[jdk21u-dev] RFR: 8342496: C2/Shenandoah: SEGV in compiled code when running jcstress

[Roland Westrelin]

Clean backport of JDK-8342496

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Commit messages:
 - Backport 680dc5d896f4f7b01b3cf800d548e32bb2ef8c81

Changes: https://git.openjdk.org/jdk21u-dev/pull/1088/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1088&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342496
  Stats: 70 lines in 2 files changed: 70 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1088.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1088/head:pull/1088

PR: https://git.openjdk.org/jdk21u-dev/pull/1088