2014-03-10  Roman Gareev  <gareevroman@gmail.com>

	gcc/
	* graphite-dependences.c (subtract_commutative_associative_deps): 
	Add NULL checking of the following variables: must_raw_no_source, 
	may_raw_no_source, must_war_no_source, may_war_no_source, 
	must_waw_no_source, may_waw_no_source.

	gcc/testsuite/gfortran.dg/graphite/pr59586.f: New testcase.