isl_test: generalize coalesce tests with unbounded wrapping
isl_test: generalize coalesce tests with unbounded wrapping

This is similar to the change in ab429a2 (isl_test: generalize coalesce tests,
Sat Mar 23 12:20:52 2013 +0100) for the coalesce tests with bounded
wrapping and makes it easier to add new tests.

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

inducer/isl-mirror,inducer/isl-mirror,simbuerg/isl,PollyLabs/isl,inducer/isl-mirror,Meinersbur/isl,tobig/isl,Meinersbur/isl,UBERTC/isl,UBERTC/isl,PollyLabs/isl,evaautomation/isl,BenzoSM/isl,nicolasvasilache/isl,BenzoSM/isl,PollyLabs/isl,nicolasvasilache/isl,Distrotech/isl,KangDroidSMProject/ISL,abduld/isl,KangDroidSMProject/ISL,SaberMod/isl-current,SaberMod/isl-current,UBERTC/isl,inducer/isl-mirror,simbuerg/isl,nicolasvasilache/isl,tobig/isl,Distrotech/isl,tobig/isl,nicolasvasilache/isl,Meinersbur/isl,Meinersbur/isl,evaautomation/isl,Distrotech/isl,inducer/isl-mirror,SaberMod/isl-current,evaautomation/isl,BenzoSM/isl,KangDroidSMProject/ISL,BenzoSM/isl,PollyLabs/isl,tobig/isl,Distrotech/isl,abduld/isl,PollyLabs/isl,nicolasvasilache/isl,simbuerg/isl,Distrotech/isl,KangDroidSMProject/ISL,KangDroidSMProject/ISL,simbuerg/isl,UBERTC/isl,abduld/isl,SaberMod/isl-current,BenzoSM/isl,evaautomation/isl,simbuerg/isl,abduld/isl