RFR: 8257815: Replace global log2 functions with efficient implementations [v11]

[Thomas Stuefe]

On Mon, 14 Dec 2020 14:29:22 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove use of make_unsigned, use UINT64_FORMAT_X to make sign extension stand out
>
> Marked as reviewed by kbarrett (Reviewer).

> @kimbarrett @stefank - thank you for reviews!
> 
> @tstuefe - re-testing latest on BE (ppc and s390?) would be much appreciated. I'm going to hold off on pushing this until some time after 16 forks off, so there's no rush.

Hi Claes, sorry, I won't get to this before the holidays. @TheRealMDoerr maybe?

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PR: https://git.openjdk.java.net/jdk/pull/1663