Makefile.in (tree-ssa-forwprop.o): Depend on langhooks.h.
* 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.