Add a 64-bit hash function for type hstore.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: eb6f29141bed9dc95cb473614c30f470ef980705
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-11-23T18:37:34Z
Releases: 12.0
Add a 64-bit hash function for type hstore.

There's some question about the correctness of the hash function, but
if it's wrong, the 32-bit version is also wrong.

Amul Sul, reviewed by Hironobu Suzuki

Discussion: https://postgr.es/m/CAAJ_b947JjnNr9Cp45iNjSqKf6PA5mCTmKsRwPjows93YwQrmw@mail.gmail.com

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