* Makefile.in (tree-ssa-forwprop.o): Depend on langhooks.h.
	* tree-ssa-forwprop.c: Include langhooks.h.
	(forward_propagate_addr_expr_into_variable_array_index): New.
	(forward_propagate_addr_expr): New.
	(tree_ssa_forward_propagate_single_use_vars): Loop over all
	the statements in the block instead of just the last statement.
	Call forward_propagate_addr_expr as needed.
	(pass_forwprop): Update the SSA graph after forward propagation is
	complete.

	* g++.dg/tree-ssa/pr18414.C: New test.
	* gcc.dg/tree-ssa/pr18414.C: New test.
	* gcc.dg/tree-ssa/pr17141-1.C: New test.
	* gcc.dg/tree-ssa/pr17141-2.C: New test.

From-SVN: r99837