RFR: 8272315: Improve assert_different_registers [v2]

[Kim Barrett]

On Wed, 11 Aug 2021 13:08:01 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> ... bearing in mind that quicksort is n.log(n) at best.
>
>> Sorting is kind of overkill. Maybe I should have just use the obvious nested loop? What do reviewers think?
> 
> No strong preference on my side. I'm fine with it either way.

Updated to use nested loops.

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PR: https://git.openjdk.java.net/jdk/pull/5083