Continuing work to convert the hppa targets to multiarch partial.

   Continuing work to convert the hppa targets to multiarch partial.

       * hppa-tdep.c: (hppa_register_raw_size): New function replacing
       the body of macro REGISTER_RAW_SIZE.
       * hppa-hpux-tdep.c: Add new functions replacing macro bodies from
       config/pa/tm-hppah.h. These functions will be used to initialize
       the gdbarch structure.
       (hppa_hpux_pc_in_sigtramp): New function.
       (hppa_hpux_frame_saved_pc_in_sigtramp): New function.
       (hppa_hpux_frame_base_before_sigtramp): New function.
       (hppa_hpux_frame_find_saved_regs_in_sigtramp): New function.
       Add gdbcore.h #include.
       * config/pa/tm-hppa.h (REGISTER_RAW_SIZE): Change the definition
       of this gdbarch-eligible macro to a call to the new associated
       function.
       * config/pa/tm-hppah.h (PC_IN_SIGTRAMP): Likewise.
       (FRAME_SAVED_PC_IN_SIGTRAMP): Change the definition of this macro
       into a call to the new associated function.
       (FRAME_BASE_BEFORE_SIGTRAMP): Likewise.
       (FRAME_FIND_SAVED_REGS_IN_SIGTRAMP): Likewise.
       * Makefile.in (hppa-hpux-tdep.o): Add dependency on gdbcore.h.