re PR tree-optimization/81627 (ICE on valid code at -O3: in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:707)

	PR tree-optimization/81627
	* tree-predcom.c (prepare_finalizers): Always rewrite into loop
	closed ssa form for store-store chain.

	gcc/testsuite
	* gcc.dg/tree-ssa/pr81627.c: New.

From-SVN: r250764