* dwarf2out.c (dwarf2out_frame_debug_expr, add_incomplete_type,
        retry_incomplete_types): Add static prototype.
        (stripattributes, dwarf_cfi_name, ASM_OUTPUT_DWARF_STRING,
        dwarf_tag_name, dwarf_attr_name, dwarf_form_name,
        dwarf_stack_op_name, dwarf_type_encoding_name, add_AT_string,
        dwarf2_name, add_name_attribute, lookup_filename, dwarf2out_line,
        dwarf2out_start_source_file, dwarf2out_define, dwarf2out_undef):
        Constify a char*.

        * dwarf2out.h (dwarf2out_define, dwarf2out_undef,
        dwarf2out_start_source_file, dwarf2out_line): Likewise.

From-SVN: r28645