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

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

Commit: 8b20f8a51deef702047cf2d6c1872de37644205a
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-12-05T04:14:27Z
Releases: 7.4.10
Add regression test to see if the min/max values of int8 convert correctly.

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