dwarf2out: Split CFI construction routines into a new file.

dwarf2out: Split CFI construction routines into a new file.

Excepting changing some functions from static to extern, this
patch contains code motion only.  The split is not very clean
at this point, but will be refined as CFI construction is turned
into its own proper pass.

        * dwarf2cfi.c: New file.
        * Makefile.in (OBJS): Add it.
        (GTFILES): Add dwarf2cfi.c and dwarf2out.h.
        * gengtype.c (open_base_files): Include dwarf2out.h.
        * coretypes.h (enum var_init_status): Move from ...
        * rtl.h: ... here.
        * dwarf2out.c (saved_do_cfi_asm, dwarf2out_do_frame,
        dwarf2out_do_cfi_asm, cie_cfi_vec, dwarf2out_cfi_label_num,
        expand_builtin_dwarf_sp_column, init_return_column_size,
        expand_builtin_init_dwarf_reg_sizes, new_cfi, add_cfi,
        dwarf2out_cfi_label, emit_cfa_remember, any_cfis_emitted, add_fde_cfi,
        lookup_cfa_1, lookup_cfa, cfa, cfa_store, cfa_remember, args_size,
        old_args_size, cfa_equal_p, def_cfa_1, reg_save, initial_return_save,
        stack_adjust_offset, barrier_args_size, compute_barrier_args_size_1,
        compute_barrier_args_size, dwarf2out_args_size,
        dwarf2out_stack_adjust, dwarf2out_notice_stack_adjust,
        queued_reg_saves, reg_saved_in_data, regs_saved_in_regs,
        compare_reg_or_pc, record_reg_saved_in_reg, last_reg_save_label,
        queue_reg_save, dwarf2out_flush_queued_reg_saves,
        clobbers_queued_reg_save, reg_saved_in, cfa_temp,
        dwarf2out_frame_debug_def_cfa, dwarf2out_frame_debug_adjust_cfa,
        dwarf2out_frame_debug_cfa_offset, dwarf2out_frame_debug_cfa_register,
        dwarf2out_frame_debug_cfa_expression,
        dwarf2out_frame_debug_cfa_restore,
        dwarf2out_frame_debug_cfa_window_save, dwarf2out_frame_debug_expr,
        dwarf2out_frame_debug, dwarf2out_frame_debug_init,
        dwarf2out_cfi_begin_epilogue, dwarf2out_frame_debug_restore_state,
        get_cfa_from_loc_descr): Move to dwarf2cfi.c.
        (dw_cfi_ref, dw_fde_ref, dw_cfi_oprnd_ref, enum dw_cfi_oprnd_type,
        dw_cfi_oprnd, dw_cfi_node, cfi_vec, dw_cfa_location, dw_fde_node,
        dw_val_ref, dw_die_ref, const_dw_die_ref, dw_loc_descr_ref,
        dw_loc_list_ref, enum dw_val_class, dw_vec_const, dw_val_node,
        dw_loc_descr_node): Move to dwarf2out.h.
        (current_fde, output_cfi_directive, build_cfa_loc, get_address_mode,
        mem_loc_descriptor): Export.
        (build_cfa_aligned_loc): Export.  Take CFA as a parameter.
        (dwarf2out_frame_init): Extract CIE generation code to
        dwarf2cfi_frame_init.

From-SVN: r176015