Fix PR42334: correct the update of the LST on loop interchange and distribution.

Fix PR42334: correct the update of the LST on loop interchange and distribution.

2009-12-15  Sebastian Pop  <sebastian.pop@amd.com>

	PR middle-end/42178
	PR middle-end/42334
	* graphite-interchange.c (lst_perfect_nestify): Reset to NULL the LSTs
	that are empty.
	(lst_do_interchange_1): Renamed lst_interchange_select_inner.
	(lst_try_interchange): Reimplemented.
	(lst_interchange_select_inner): Same.
	(lst_do_interchange): Renamed lst_interchange_select_outer.
	Reimplemented.
	(scop_do_interchange): Update use of lst_interchange_select_outer.

	* testsuite/g++.dg/graphite/pr42130.C: Add -fgraphite-identity.
	* testsuite/gcc.dg/graphite/block-0.c: Un-XFAILed.
	* testsuite/gcc.dg/graphite/pr42211.c: New.
	* testsuite/gfortran.dg/graphite/pr42334.f90: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/graphite@155248 138bc75d-0d04-0410-961f-82ee72b054a4