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

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

Commit: dc68b9ec305fdf831b98a1d80b09753939fa4c59
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-12-05T04:13:53Z
Releases: 8.1.1
Add regression test to see if the min/max values of int8 convert correctly.

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