[crac] RFR: Simplify CPUFeatures code

[Jan Kratochvil]

On Sat, 16 Sep 2023 15:41:32 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

> There is no functionality change. I guess the new code should be more simple and shorter. It was originally suggested by @AntonKozlov to use more functions than macros.
> 
> 
>  1 file changed, 44 insertions(+), 82 deletions(-)
>  ```
> So I find it clearly an improvement.
> The readable sub-commit is: https://github.com/openjdk/crac/pull/112/commits/6d9cb72b7a838dd4c9f107c5b71c4275005a0c23
> Otherwise it gets messed up by the other commit just renaming things.
> As an explanation: Original code had two lists of the same CPU features. An `EXCESSIVE` list and an `GLIBC_DISABLE` list. The had to be kept in sync (their sets being equal) which was sanity checked:
> 
>     if (PASTE_TOKENS(disable_handled_, kind) != PASTE_TOKENS(excessive_handled_, kind))                                                  \
> 
> So now there is the list just once (`EXCESSIVE`, the `GLIBC_DISABLE` one has been deleted). It looks stupid but when coding it I did not see it.
> Coding both variants of #136 was needlessly more difficult without this pull request applied and now I have to rebase this pull request.

Converted it to draft until #139 gets accepted.

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PR Comment: https://git.openjdk.org/crac/pull/112#issuecomment-1814367990