* Add PIC support for CR16 target.

    * Add PIC support for CR16 target.
        * elf32-cr16.c (R_CR16_GOT_REGREL20, R_CR16_GOTC_REGREL20 and
        R_CR16_GLOB_DAT): New macros
        (cr16_elf_howto_table): Add entries for for R_CR16_GOT_REGREL20,
        R_CR16_GOTC_REGREL20 and R_CR16_GLOB_DAT.
        (cr16_reloc_map): Ditto
        (_bfd_cr16_elf_create_got_section): New function to create GOT section.
        (_bfd_cr16_elf_create_dynamic_sections): New function to create dynamic
        section.
        (_bfd_cr16_elf_adjust_dynamic_symbol): New function to adjust symbol
        defined by dynamic object.
        (_bfd_cr16_elf_size_dynamic_sections): New function to find the size
        of dynamic section.
        (_bfd_cr16_elf_finish_dynamic_symbol): New function to handle dynamic
        symbols.
        (_bfd_cr16_elf_finish_dynamic_symbol): New function to handle dynamic
        sections.
        (bfd_cr16_elf32_create_embedded_relocs): New function to create
        embedded relocs in .emreloc section in memory for .data.rel section.
        (_bfd_cr16_elf_reloc_type_class): New function for classify reloc types.
        (cr16_elf_check_relocs): New function for checking reloc types in
        first phase.
        (cr16_elf_final_link_relocate): Update for handling the new reloc
        types R_CR16_GOT_REGREL20 and R_CR16_GOTC_REGREL20.
        (elf32_cr16_relax_section): Update relax implementation.
        * reloc.c (bfd_reloc_code_type): Add entries for R_CR16_GOT_REGREL20,
        R_CR16_GOTC_REGREL20 and R_CR16_GLOB_DAT.
        * bfd-in.h (bfd_boolean bfd_cr16_elf32_create_embedded_relocs): Declared
        * libbfd.h, bfd-in2.h: Regenerate.