Frank Denis ee4df4ad3e
crypto - threaded K12: separate context computation from thread spawning (#25793)
* threaded K12: separate context computation from thread spawning

Compute all contexts and store them in a pre-allocated array,
then spawn threads using the pre-computed contexts.

This ensures each context is fully materialized in memory with the
correct values before any thread tries to access it.

* kt128: unroll the permutation rounds only twice

This appears to deliver the best performance thanks to improved cache
utilization, and it’s consistent with what we already do for SHA3.
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