DarkSharpness

[Feature] HiCache JIT kernel (once again)

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## Motivation A fixed and improved version of #13453. ## Modifications 1. Rebase to main. 2. Fix compatibility issue, support `gcc >= 11.4.0`. Since `gcc 11.4.0` is widely used and...

[Misc] Use persistent thread pool

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Previously, each function call of `MultiThreadCompileGrammar` created its own thread pool. This could be misleading, as the total number of active worker threads might significantly exceed the configured max_threads —...