[jdk17u-dev] RFR: 8270090: C2: LCM may prioritize CheckCastPP nodes over projections

[Goetz Lindenmaier]

I backport this for parity with 17.0.5-oracle.

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Depends on: https://git.openjdk.java.net/jdk17u-dev/pull/441

Commit messages:
 - Backport 89392fb15e9652b7b562b3511f79bda725c5499c

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/442/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=442&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8270090
  Stats: 30 lines in 1 file changed: 11 ins; 9 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/442.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/442/head:pull/442

PR: https://git.openjdk.java.net/jdk17u-dev/pull/442