re PR tree-optimization/55964 (Segmentation fault with -O -ftree-loop-distribution...

re PR tree-optimization/55964 (Segmentation fault with -O -ftree-loop-distribution -funswitch-loops)

2013-01-16  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/55964
	* tree-flow.h (rename_variables_in_loop): Remove.
	(rename_variables_in_bb): Likewise.
	* tree-loop-distribution.c (update_phis_for_loop_copy): Remove.
	(copy_loop_before): Adjust and delete update-ssa status.
	* tree-vect-loop-manip.c (rename_variables_in_bb): Make static.
	(rename_variables_in_bb): Likewise.  Properly walk over
	predecessors.
	(rename_variables_in_loop): Remove.
	(slpeel_update_phis_for_duplicate_loop): Likewise.
	(slpeel_tree_duplicate_loop_to_edge_cfg): Handle nested loops,
	use available cfg machinery instead of duplicating it.
	Update PHI nodes and perform poor-mans SSA update here.
	(slpeel_tree_peel_loop_to_edge): Adjust.

	* gcc.dg/torture/pr55964.c: New testcase.

From-SVN: r195239