RFR: 8257815: Replace global log2 functions with efficient implementations [v8]

[Stefan Karlsson]

On Wed, 9 Dec 2020 19:27:58 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Issue with using count_trailing_zeros with 64-bit values on 32-bit, revert and add TODO
>
> I'm fine with the change as is. I have a few comments that you might want to consider.

Yes, I'm happy with the current patch. Thanks for considering my suggestions.

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