RFR: 8278228: C2: Improve identical back-to-back if elimination [v5]

[Roland Westrelin]

On Mon, 10 Jan 2022 07:34:22 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> Roland Westrelin has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   review
>
> Testing completed and looked good!

@chhagedorn @vnkozlov thanks for the reviews and testing.

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PR: https://git.openjdk.java.net/jdk/pull/6882