RFR: 8272114: Unused _last_state in osThread_windows

[Yi Yang]

On Sat, 18 Sep 2021 08:45:39 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Trivial change to remove unused _last_state in osThread_windows， its getter and setter can be removed as well.
>
> Good and trivial. Tried to find out the history, but AFAICS its been in there since the beginning of OpenJDK.

Thanks @tstuefe and @dholmes-ora for reviews!

-------------

PR: https://git.openjdk.java.net/jdk/pull/5572