Speed up hash_index regression test.

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

Commit: 4a8bc39b08aa83694f22ea56a8626e91e28a0227
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-04-12T20:17:53Z
Releases: 10.0
Speed up hash_index regression test.

Commit f5ab0a14e made this test take substantially longer than it used
to.  With a bit more care, we can get the runtime back down while
achieving the same, or even a bit better, code coverage.

Mithun Cy

Discussion: https://postgr.es/m/CAD__Ouh-qaEb+rD7Uy-4g3xQYOrhPzHs-a_TrFAjiQ5azAW5+w@mail.gmail.com

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