[jdk19u] RFR: 8290529: C2: assert(BoolTest(btest).is_canonical()) failure [v4]

[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

Tobias Hartmann has updated the pull request incrementally with one additional commit since the last revision:

  Removed now unused IRNode declarations

-------------

Changes:
  - all: https://git.openjdk.org/jdk19u/pull/37/files
  - new: https://git.openjdk.org/jdk19u/pull/37/files/19a9545a..98edb49c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk19u&pr=37&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk19u&pr=37&range=02-03

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 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