irgopt: Remove the constant-true return value from optimize_graph_df().
irgopt: Remove local_opts().

It just calls optimize_graph_df().
Its documentation was that of optimize_graph_df() anyway.
Combo cannot handle Tuple nodes.
irgwalk_blk: Use the given irg instead of current_ir_graph.
ia32: Pass irg to ia32_gen_fp_known_const() instead of using current_ir_graph.
ia32: Pass irg to get_noreg() insetad of using current_ir_graph.
irouts: Do not use current_ir_graph in the outs walker.
irgwalk: Do not use current_ir_graph in irg_walk_in_or_dep().
irgwalk_blk: Do not use current_ir_graph.
NULL in the initializer field is allowed
add support for jcr section