re PR tree-optimization/41454 (DOM miscompiles gcc.c-torture/execute/990513-1.c at -O2 -fno-tree-vrp)

	PR tree-optimization/41454
	* tree-ssa-dom (stmts_to_rescan): Remove variable.
	(tree_ssa_dominator_optimize): Don't allocate and free it.
	(dom_opt_leave_block): Don't iterate over it.
	(eliminate_redundant_computations): Don't return a value.
	(cprop_operand, cprop_into_stmt): Ditto.
	(optimize_stmt): Don't defer updating stmts.

testsuite/
	* gcc.dg/pr41454.c: New test.

From-SVN: r152189