Change hash function for Compress.
Change hash function for Compress.

((a*b)>>18) & mask has higher throughput than (a*b)>>shift, and produces the
same results when the hash table size is 2**14. In other cases, the hash
function is still good, but it's not as necessary for that to be the case as
the input is small anyway. This speeds up in encoding, especially in cases
where hashing is a significant part of the encoding critical path (small or
uncompressible files).

PiperOrigin-RevId: 341498741
Change-Id: I359cbf5a38f680dd16fe5828fab20aae291915ef

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