[SE-0206][stdlib] Implement Hasher API (underscored) #16009
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(This is change no. 1 in a series of PRs spawned from #15939) |
lorentey
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This renames
appendtocombine, and adds support for combining any number of bytes to_Hasher. However,_Hasherremains non-public for now; I'll submit a separate PR to de-underscore it pending the proposal's acceptance.The new functionality implemented here will be used to speed up hashing in followup PRs.
This PR also de-gybs the SipHash implementation, unifying the implementation of the two variants. (SipHash-2-4 remains unused in the stdlib; it can be safely removed later.)