Rename object in test to avoid conflict

Peter Eisentraut <peter@eisentraut.org>

Commit: afaccbba787d5f1470c44ddd61c9ddaaad19e27e
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2020-11-19T10:34:54Z
Releases: 14.0
Rename object in test to avoid conflict

In 01e658fa74cb7e3292448f6663b549135958003b, the hash_func test
creates a type t1, but apparently a test running in parallel might
also use that name, depending on timing.  Rename the type to avoid the
issue.

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