Use ThreadLocalRandom for include scanning shuffling. LegacyIncludeScanner previously used a shared java.util.Random(88) instance to shuffle header inclusions. Under high concurrency, concurrent calls to Random.nextInt() caused severe CAS contention on its internal AtomicLong seed. Replacing it with ThreadLocalRandom.current() eliminates lock/CAS contention and restores inclusion shuffling across both sync and async execution. PiperOrigin-RevId: 972478655 Change-Id: I265baebdd12b28b7a9cc74f632da54a06c31af9f
{Fast, Correct} - Choose two
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