RFR: 8308094: Add a compilation timeout flag to catch long running compilations [v4]

[Manuel Hässig]

On Thu, 7 Aug 2025 18:57:14 GMT, Dean Long <dlong at openjdk.org> wrote:

>> Manuel Hässig has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   ASSERT
>
> Thinking about _timeout_armed a little more, the fact the the signal handler received TIMEOUT_SIGNAL should be enough.  The value of _timeout_armed should be redundant, and your assert could be changed to:
> 
> assert(false, "compile task timed out");
> 
> and _timeout_armed could be removed. It's just an inexact mirror of the timer state.

Thank you for your reviews, @dean-long and @chhagedorn!

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PR Comment: https://git.openjdk.org/jdk/pull/26023#issuecomment-3209292036