[crac] RFR: 8355974: [CRaC] Move CPUFeatures verification to the parent process of JVM [v11]

[Jan Kratochvil]

On Tue, 13 May 2025 19:12:01 GMT, Timofei Pushkin <tpushkin at openjdk.org> wrote:

>> src/java.base/share/native/libcrexec/crexec.cpp line 559:
>> 
>>> 557:   }
>>> 558:   FILE *f = fopen(fname, "w");
>>> 559:   if (f == NULL) {
>> 
>> A nitpick, would also be great to replace in the other places in the file
>> Suggestion:
>> 
>>   if (f == nullptr) {
>
> Would also be great to use `static_cast` and friends instead of C-style casts but since it can be cumbersome to replace sometimes I don't insist

Done the `nullptr`. Personally I do not use C casts in my code at all but by some grepping it looks to me hotspot is mostly using the C costs so I just went with the flow. I do not see casts mentioned in the [style guide](https://github.com/openjdk/jdk/blob/master/doc/hotspot-style.md).

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PR Review Comment: https://git.openjdk.org/crac/pull/227#discussion_r2092944469