[jdk17u] RFR: 8274145: C2: condition incorrectly made redundant with dominating main loop exit condition

[Tobias Hartmann]

Backport of [JDK-8274145](https://bugs.openjdk.java.net/browse/JDK-8274145). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8274145: C2: condition incorrectly made redundant with dominating main loop exit condition

Changes: https://git.openjdk.java.net/jdk17u/pull/178/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=178&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274145
  Stats: 149 lines in 3 files changed: 148 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/178.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/178/head:pull/178

PR: https://git.openjdk.java.net/jdk17u/pull/178