[jdk19u] RFR: 8290964: C2 compilation fails with assert "non-reduction loop contains reduction nodes"

[Tobias Hartmann]

Backport of [JDK-8290964](https://bugs.openjdk.java.net/browse/JDK-8290964). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8290964: C2 compilation fails with assert "non-reduction loop contains reduction nodes"

Changes: https://git.openjdk.org/jdk19u/pull/84/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19u&pr=84&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290964
  Stats: 21 lines in 3 files changed: 0 ins; 21 del; 0 mod
  Patch: https://git.openjdk.org/jdk19u/pull/84.diff
  Fetch: git fetch https://git.openjdk.org/jdk19u pull/84/head:pull/84

PR: https://git.openjdk.org/jdk19u/pull/84