Improve test for CONVERT() with GB18030 <-> UTF8.

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

Commit: 199f5973c50fe94e128508ff2218c42126fd0ee1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2015-05-15T21:03:23Z
Releases: 9.5.0
Improve test for CONVERT() with GB18030 <-> UTF8.

Add a bit of coverage of high code points.

Arjen Nienhuis

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