[jdk17u-dev] RFR: 8280123: C2: Infinite loop in CMoveINode::Ideal during IGVN

[Martin Doerr]

Clean backport of [JDK-8280123](https://bugs.openjdk.java.net/browse/JDK-8280123)

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Commit messages:
 - Backport 3f747368b9a5c321d2724ba57103f17edc166251

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/198/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=198&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280123
  Stats: 93 lines in 2 files changed: 72 ins; 4 del; 17 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/198.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/198/head:pull/198

PR: https://git.openjdk.java.net/jdk17u-dev/pull/198