[jdk21u-dev] RFR: 8325494: C2: Broken graph after not skipping CastII node anymore for Assertion Predicates after JDK-8309902

[Martin Doerr]

Clean backport of [JDK-8325494](https://bugs.openjdk.org/browse/JDK-8325494).

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Commit messages:
 - Backport 9fd78022b19149ade40f92749f0b585ecfd41410

Changes: https://git.openjdk.org/jdk21u-dev/pull/734/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=734&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325494
  Stats: 67 lines in 2 files changed: 67 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/734.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/734/head:pull/734

PR: https://git.openjdk.org/jdk21u-dev/pull/734