[crac] RFR: Refactoring - extracted crac files

[Anton Kozlov]

On Fri, 16 Jun 2023 10:20:35 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`.

src/hotspot/share/runtime/arguments.cpp line 3235:

> 3233: #endif // CAN_SHOW_REGISTERS_ON_ASSERT
> 3234: 
> 3235:   if (CRaCCheckpointTo && !crac::Linux::prepare_checkpoint()) {

Does it really make sense to have `crac::Linux` instead of just `crac::`? The most of the operations are not related to Linux, so it may be even better to start abstracting them from Linux in this PR, to avoid another similar renaming in the same place.

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PR Review Comment: https://git.openjdk.org/crac/pull/84#discussion_r1232131731