ART: Fix critical edge checks in GraphChecker

Previous CL I5a13b8bb74509b48f5d628906f7158af007f99ae fixed logic for
splitting critical edges. The same logic is used in GraphChecker when
testing critical edges weren't introduced by a pass. This patch updates
it too.

Bug: 25493695
Bug: 25454012
Change-Id: I56226c82324ee55ae2fbe7262608dd2868d930f1
1 file changed