Implement semaphore-based AOT compilation throttling #249
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PR Description
The code implements a semaphore-based system to limit concurrent AOT compilation processes using the JC_PAR_PRECOMP_SEM environment variable. It includes proper RAII cleanup, signal-safe waiting, and assumes the semaphore is pre-created by a parent process to control compilation parallelism. This is done to limit the amount of processes that can enter the memory intensive part of the AOT compilation.
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