RFR: 8257498: Remove useless skeleton predicates [v3]

[Christian Hagedorn]

On Thu, 21 Jan 2021 08:56:53 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> Christian Hagedorn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix removal from global list and update get_skeleton_predicates
>
> src/hotspot/share/opto/loopnode.cpp line 3585:
> 
>> 3583:   }
>> 3584: }
>> 3585: 
> 
> I didn't realize you would have to go through an extra list. So I guess what you had before with the get_opaque parameter was better.

Yes, we need an extra one. I reverted that part back again.

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PR: https://git.openjdk.java.net/jdk/pull/2075