Fix parallel bitmapscan tests on builds without USE_PREFETCH.

Andres Freund <andres@anarazel.de>

Commit: d611517fc44ebbf7e0d563de6d4cd98fd342a762
Author: Andres Freund <andres@anarazel.de>
Date: 2017-04-06T21:22:27Z
Releases: 10.0
Fix parallel bitmapscan tests on builds without USE_PREFETCH.

This was broken in 5a5931533edd2.

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