testsuite: Fix pr94589-5a.c

I did test this testcase but I must have missed it failing somehow.
Anyways the problem is the scan-tree-dump is missing checking for u< and u>
which can show up in some cases.

Pushed as obvious after a quick test to make sure there is no failure any more.

gcc/testsuite/ChangeLog:

	* gcc.dg/pr94589-5a.c: Allow for `u<` and `u>` in the scan too.

Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>