Harden pg_stat_statements tests against CLOBBER_CACHE_ALWAYS.

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

Commit: 0806d08d4626f0a71a4e83cb399ee965a8aac99b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-07-26T03:25:15Z
Releases: 15.0
Harden pg_stat_statements tests against CLOBBER_CACHE_ALWAYS.

Turns out the buildfarm hasn't been testing this, which will soon change.

Julien Rouhaud, per report from me

Discussion: https://postgr.es/m/42557.1627229005@sss.pgh.pa.us

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