RFR: 8279886: C1: Turn off SelectivePhiFunctions in presence of irreducible loops [v2]

[Igor Veresov]

On Tue, 1 Mar 2022 21:07:01 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Igor Veresov has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:
>> 
>>  - Add comments
>>  - Detect irreducible loops during parsing/phi insertion.
>
> Looks good.

Thanks @vnkozlov and @dean-long for the reviews!

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PR: https://git.openjdk.java.net/jdk/pull/7636