[jdk21u-dev] RFR: 8308660: C2 compilation hits 'node must be dead' assert

[Martin Doerr]

Backport of [JDK-8308660](https://bugs.openjdk.org/browse/JDK-8308660).

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Commit messages:
 - Backport 053ff76e14046f796f6e10a9cb2ede1f1ae22ed6

Changes: https://git.openjdk.org/jdk21u-dev/pull/729/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=729&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308660
  Stats: 73 lines in 2 files changed: 73 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/729.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/729/head:pull/729

PR: https://git.openjdk.org/jdk21u-dev/pull/729