RFR: 8260019: Move some Thread subtypes out of thread.hpp [v2]

[Stefan Karlsson]

On Fri, 5 Feb 2021 02:57:20 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> I think the rule has been: if it's a new file, it gets a new year.
>
> Hi David, you're correct that I just cut-and-pasted the code; the only exception was I made the `thread_entry` functions member functions.
> 
> I don't have a better idea for the file names, either. I'll keep them as is in the patch. Maybe someone else with a better sense for naming could fix our file names in the future.
> 
> I fixed the copyright year.

> I think the rule has been: if it's a new file, it gets a new year.

My understanding is that if code has been copied, then the old copyright dates should be kept.

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PR: https://git.openjdk.java.net/jdk/pull/2390