RFR: 8252406: Introduce Thread::as_Java_thread() convenience function [v5]

[Coleen Phillimore]

On Tue, 8 Sep 2020 19:07:01 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> David Holmes has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   This is a simpler approach to use the static_cast. Changes:
>>   - Change C-style cast to static_cast and move function definitions so this works.
>>   - Use overloading for const and non-const versions of as_Java_thread().
>>   - Update copyright years.
>>   
>>   Re-testing builds in tiers 1-5.
>>   
>>   Thanks.
>
> Marked as reviewed by coleenp (Reviewer).

I'll look at v5 diffs but if I don't, this is still reviewed.  Nice cleanup.

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PR: https://git.openjdk.java.net/jdk/pull/37