intrinsic-test: combine rust files for faster compilation
#1863
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This was referenced Jul 16, 2025
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so that we get more parallelism out of cargo
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This PR combines the rust intrinsics into number-of-cores crates, to optimize for parallelism.
It also changes the code emission strategy for tests with const-generics. Rather than duplicating test logic, we now build a big array of specialized function pointers, and iterate over this array. This logic is a bit weird to continue to match the C output order.
Locally this brings the
aarch64_bedocker run down from ~120s to ~85s.