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

[Tobias Hartmann]

On Wed, 28 Sep 2022 08:31:40 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> 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

Thanks, Vladimir!

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