RFR: 8230382: Clean up ConvI2L, CastII and CastLL::Ideal methods [v3]

[Emanuel Peter]

On Mon, 28 Feb 2022 09:12:02 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> Emanuel Peter has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   code style issues
>
> Looks good to me.

Thanks @rwestrel for the review! Thanks @TobiHartmann for the help, corrections and review!

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PR: https://git.openjdk.java.net/jdk/pull/7609