[crac] RFR: Extract crac functionality into OS-agnostic files

[Radim Vansa]

On Fri, 16 Jun 2023 10:23:06 GMT, Roman Marchenko <rmarchenko at openjdk.org> wrote:

>> CRaC-related functionality is moved to `crac*.hpp/cpp` files, and now it is in `crac` class instead of `os`.
>
> @AntonKozlov @rvansa 
> Hi,
> As we discussed before, I extracted crac* files. Hopefully it will help with futher java version upgrade and win/mac build.

@wkia Integrating #53 regrettably brought a conflict, shouldn't be difficult to resolve, though. Thanks!

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PR Comment: https://git.openjdk.org/crac/pull/84#issuecomment-1597265647