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

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

Commit: 8cb4e4f6bdb77689662f435f8fb4816e4a708734
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-12-05T04:13:38Z
Releases: 8.2.0
Add regression test to see if the min/max values of int8 convert correctly.

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