re PR tree-optimization/46498 (ICE: in eliminate_unnecessary_stmts, at tree-ssa-dce.c:1112 with -O -funsafe-math-optimizations -fno-tree-dominator-opts -fno-tree-reassoc)

2010-11-16  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/46498
	* tree-ssa-dce.c (perform_tree_ssa_dce): Compute dominator info.

From-SVN: r166861