re PR tree-optimization/47849 (ICE: SIGSEGV in find_edge (cfganal.c:491) with -ftree-loop-if-convert -fno-tree-reassoc)

2011-02-23  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/47849
	* tree-if-conv.c (main_tree_if_conversion): Free postdom info.

From-SVN: r170441