[jdk19u] RFR: 8290529: C2: assert(BoolTest(btest).is_canonical()) failure

[Tobias Hartmann]

Backport of [JDK-8290529](https://bugs.openjdk.java.net/browse/JDK-8290529). Applies cleanly except for a change to surrounding code in `IRNode.java`. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8290529: C2: assert(BoolTest(btest).is_canonical()) failure

Changes: https://git.openjdk.org/jdk19u/pull/37/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19u&pr=37&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290529
  Stats: 113 lines in 4 files changed: 110 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk19u/pull/37.diff
  Fetch: git fetch https://git.openjdk.org/jdk19u pull/37/head:pull/37

PR: https://git.openjdk.org/jdk19u/pull/37