RFR: 8265867: thread.hpp defines some enums but no reference [v2]

[David Holmes]

On Tue, 27 Apr 2021 18:22:57 GMT, Xin Liu <xliu at openjdk.org> wrote:

>> Deleted 2 useless enums.
>> This patch also added const and constexpr for the applicable member functions.
>
> Xin Liu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert code change about "constness".

Looks good - and now trivial :)

Thanks,
David

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/3702