Frank Denis f540dc1b7e cache_hash: hash function change ...

This makes the `cache_hash` hash function easier to replace.

BLAKE3 would be a natural fit for hashing large files, but:
- second preimage resistance is not necessary for the cache_hash use cases
- our BLAKE3 implementation is currently very slow

Switch to SipHash128, which gives us an immediate speed boost.

2020-08-22 15:10:33 -04:00

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