re PR fortran/24524 (Fortran dependency checking should reverse loops)

2009-07-23  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/24524
	* trans-array.c (gfc_init_loopinfo): Initialize the reverse
	field.
	gfc_trans_scalarized_loop_end: If reverse set in dimension n,
	reverse the scalarization loop.
	gfc_conv_resolve_dependencies: Pass the reverse field of the
	loopinfo to gfc_dep_resolver.
	trans-expr.c (gfc_trans_assignment_1): Enable loop reversal for
	assignment by resetting loop.reverse.
	gfortran.h : Add the gfc_reverse enum.
	trans.h : Add the reverse field to gfc_loopinfo.
	dependency.c (gfc_check_dependency): Pass null to the new arg
	of gfc_dep_resolver.
	(gfc_check_section_vs_section): Check for reverse dependencies.
	(gfc_dep_resolver): Add reverse argument and deal with the loop
	reversal logic.
	dependency.h : Modify prototype for gfc_dep_resolver to include
	gfc_reverse *.

From-SVN: r162462