Suppress compiler warning.

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

Commit: d9b9289c837a98b78b948b597fabd9ab0a96c0db
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-01-22T02:14:07Z
Releases: 9.6.0
Suppress compiler warning.

Given the limited range of i, these shifts should not cause any
problem, but that apparently doesn't stop some compilers from
whining about them.

David Rowley

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