re PR middle-end/64928 (Inordinate cpu time and memory usage in "phase opt and generate" with -ftest-coverage -fprofile-arcs)

2015-03-06  Richard Biener  <rguenther@suse.de>

	PR middle-end/64928
	* tree-ssa-live.h (struct tree_live_info_d): Add livein_obstack
	and liveout_obstack members.
	(calculate_live_on_exit): Remove.
	(calculate_live_ranges): Change declaration.
	* tree-ssa-live.c (liveness_bitmap_obstack): Remove global var.
	(new_tree_live_info): Adjust.
	(calculate_live_ranges): Delete livein when not wanted.
	(calculate_live_ranges): Do not initialize liveness_bitmap_obstack.
	Deal with partly deleted live info.
	(loe_visit_block): Remove temporary bitmap by using
	bitmap_ior_and_compl_into.
	(live_worklist): Adjust accordingly.
	(calculate_live_on_exit): Make static.
	* tree-ssa-coalesce.c (coalesce_ssa_name): Tell calculate_live_ranges
	we do not need livein.

From-SVN: r221237