[jdk11u-dev] RFR: 8270090: C2: LCM may prioritize CheckCastPP nodes over projections

[Goetz Lindenmaier]

I backport this for parity with 11.0.17-oracle.

I had to resolve the copyright, will mark as clean.

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Commit messages:
 - Backport 8ebea443f333ecf79d6b0fc725ededb231e83ed5

Changes: https://git.openjdk.org/jdk11u-dev/pull/1178/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1178&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/jdk11u-dev/pull/1178.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1178/head:pull/1178

PR: https://git.openjdk.org/jdk11u-dev/pull/1178