Add regression test to see if the min/max values of int8 convert correctly.

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

Commit: 304b231e7bc808f909ac497c809c6a31975f9372
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-12-05T04:14:39Z
Releases: 7.3.12
Add regression test to see if the min/max values of int8 convert correctly.

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