dwarf2: Move CFI output routines to dwarf2cfi.c.

dwarf2: Move CFI output routines to dwarf2cfi.c.

        * defaults.h (DWARF2_ADDR_SIZE, DWARF_OFFSET_SIZE,
        DWARF_TYPE_SIGNATURE_SIZE): Move from ...
        * dwarf2out.c: ... here.
        (output_all_cfis): Remove.
        (dwarf2out_switch_text_section): Use output_cfis directly.
        (size_of_locs): Export.
        (output_loc_sequence, output_loc_sequence_raw): Export.
        (div_data_align, need_data_align_sf_opcode, dwarf_cfi_name, output_cfi,
        output_cfi_directive, dwarf2out_emit_cfi, output_cfis, output_cfa_loc,
        output_cfa_loc_raw): Move to ...
        * dwarfcfi.c: ... here.
        * dwarf2out.h: Update decls.

From-SVN: r176107