tree-ssa-dce.c (perform_tree_ssa_dce): Allocate visited bitmap.

2009-11-26  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-dce.c (perform_tree_ssa_dce): Allocate visited bitmap.

From-SVN: r154672

gcc/ChangeLog

+2009-11-26  Richard Guenther  <rguenther@suse.de>
+
+	* tree-ssa-dce.c (perform_tree_ssa_dce): Allocate visited bitmap.
+
 2009-11-26  Nick Clifton  <nickc@redhat.com>
 
 	* config/rx/rx.c (rx_expand_epilogue): Add checks for sibcalls

gcc/tree-ssa-dce.c

@@ -1377,6 +1377,7 @@ perform_tree_ssa_dce (bool aggressive)
   longest_chain = 0;
   total_chain = 0;
   chain_ovfl = false;
+  visited = BITMAP_ALLOC (NULL);
   propagate_necessity (el);
   BITMAP_FREE (visited);