[jdk21u-dev] RFR: 8318049: C2: assert(!failure) failed: Missed optimization opportunity in PhaseIterGVN

[Yude Lin]

Hi,

I'd like to backport 8318049 as part of a fix for a test. Thanks.

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Commit messages:
 - Backport a03767cf8868a200f5be74c4cf8cdf5f76f1e678

Changes: https://git.openjdk.org/jdk21u-dev/pull/1454/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1454&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318049
  Stats: 62 lines in 2 files changed: 58 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1454.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1454/head:pull/1454

PR: https://git.openjdk.org/jdk21u-dev/pull/1454