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

[Roman Marchenko]

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`.

This pull request has now been integrated.

Changeset: f0cdb1fb
Author:    Roman Marchenko <rmarchenko at openjdk.org>
Committer: Anton Kozlov <akozlov at openjdk.org>
URL:       https://git.openjdk.org/crac/commit/f0cdb1fbf6dacfb7f8a3f2307a5538f8a4c8731f
Stats:     2421 lines in 12 files changed: 1246 ins; 1168 del; 7 mod

Extract crac functionality into OS-agnostic files

Reviewed-by: rvansa, akozlov

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PR: https://git.openjdk.org/crac/pull/84