re PR tree-optimization/46183 (ICE: in calc_dfs_tree, at dominance.c:396 with -O -fno-dse -fgcse -ftree-pre)

2010-11-04  Richard Guenther  <rguenther@suse.de>

	PR rtl-optimization/46183
	* gcse.c (execute_rtl_cprop): Cleanup the CFG if something changed.
	(execute_rtl_pre): Likewise.
	(execute_rtl_hoist): Likewise.

	* gcc.dg/torture/pr46183.c: New testcase.

From-SVN: r166316