Attempt to fix breakage caused by signed integer conversion patch.

Robert Haas <rhaas@postgresql.org>

Commit: 815810ed315a6d21203ec75a11f742f5ed655418
Author: Robert Haas <rhaas@postgresql.org>
Date: 2010-11-20T06:09:26Z
Releases: 9.1.0
Attempt to fix breakage caused by signed integer conversion patch.

Use INT_MIN rather than INT32_MIN as we do elsewhere in the code, and
try to work around nonexistence of INT64_MIN if necessary.  Adjust the
new regression tests to something hopefully saner, per observation by
Tom Lane.

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