R_SHORT_PCREL_MODE.
(hppa_som_gen_reloc_type): Handle both short and long pcrel branches.
(som_write_fixups): Eliminate redundant pcrel mode relocs. Handle
R_LONG_PCREL_MODE and R_SHORT_PCREL_MODE
* libhppa.h (dis_assemble_22): New function.
(bfd_hppa_insn2fmt): Handle long branch.
* libhppa.h (bfd_hppa_insn2fmt): Decode and handle formats found
in PA2.0.