[jdk18u] RFR: 8270090: C2: LCM may prioritize CheckCastPP nodes over projections

[Tobias Hartmann]

Backport of [JDK-8270090](https://bugs.openjdk.java.net/browse/JDK-8270090). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8270090: C2: LCM may prioritize CheckCastPP nodes over projections

Changes: https://git.openjdk.org/jdk18u/pull/167/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk18u&pr=167&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8270090
  Stats: 37 lines in 1 file changed: 22 ins; 8 del; 7 mod
  Patch: https://git.openjdk.org/jdk18u/pull/167.diff
  Fetch: git fetch https://git.openjdk.org/jdk18u pull/167/head:pull/167

PR: https://git.openjdk.org/jdk18u/pull/167