[jdk17u-dev] RFR: 8280600: C2: assert(!had_error) failed: bad dominance

[Martin Doerr]

Clean backport of [JDK-8280600](https://bugs.openjdk.java.net/browse/JDK-8280600)

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Commit messages:
 - Backport de826ba18a5e98586029581c2d4bcd27334fbdd1

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/297/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=297&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280600
  Stats: 54 lines in 2 files changed: 53 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/297.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/297/head:pull/297

PR: https://git.openjdk.java.net/jdk17u-dev/pull/297