[ia64-hpux] inferior function call support

We have two stacks to deal with on ia64, when making a function call.
The first is the usual stack frame, and the second is the register
stack frame.  On ia64-linux, the register frame is setup by adjusting
the BSP register.  Unfortunately for us, the HP-UX kernel does not allow
the debugger to change the value of the BSP.

To work around that limitation, the method I am using here is to push
some assembly code on the stack. This assembly code contains, among
other things, a call to the alloc insn, which sets up our frame for us.
An extensive comment in ia64-hpux-tdep.c explains the entire procedure.

Despite this approach, most of the code in ia64-tdep.c which sets up
the function call is still applicable - and only a few things need
to be done differently:  For instance, instead of changing the BSP,
we do nothing.  We store the parameters at a different location, etc.
So this patch also adjusts the inf-call code in ia64-tdep.c to make it
a little more extensible: I create a new ia64_infcall_ops structure
which allows an ABI to define how the few things that need to be
differentiated.

Another element that turned out to be necessary but is more of a detail
is that the computation of the linkage pointer needs to be handled
specially for symbols inside shared libraries.  This is especially
visible when calling malloc, which happens everytime memory needs to
be allocated in inferior memory...  The special treatment included
again the necessity to use some routines only available on the host.
So another target object TARGET_OBJECT_HPUX_SOLIB_GOT was created for
that purpose.

gdb/ChangeLog:

        * ia64-tdep.h (struct regcache): Forward declare.
        (struct ia64_infcall_ops): New struct type.
        (struct gdbarch_tdep): New fields "find_global_pointer_from_solib"
        and "infcall_ops".
        * ia64-tdep.c (ia64_find_global_pointer_from_dynamic_section):
        Renames ia64_find_global_pointer.
        (ia64_find_global_pointer, ia64_allocate_new_rse_frame)
        (ia64_store_argument_in_slot, ia64_set_function_addr: New function.
        (ia64_push_dummy_call): Adjust to use the new tdep ia64_infocall_ops
        methods.
        (ia64_infcall_ops): New static global constant.
        (ia64_gdbarch_init): Set tdep->infcall_ops.
        * ia64-hpux-nat.c (ia64_hpux_xfer_solib_got): New function.
        (ia64_hpux_xfer_partial): Add TARGET_OBJECT_HPUX_SOLIB_GOT handing.
        * ia64-hpux-tdep.c: Include "regcache.h", "gdbcore.h" and "inferior.h".
        (ia64_hpux_dummy_code): New static global constant.
        (ia64_hpux_push_dummy_code, ia64_hpux_allocate_new_rse_frame)
        (ia64_hpux_store_argument_in_slot, ia64_hpux_set_function_addr)
        (ia64_hpux_dummy_id, ia64_hpux_find_global_pointer_from_solib):
        New function.
        (ia64_hpux_infcall_ops): New static global constant.
        (ia64_hpux_init_abi): Install gdbarch and tdep methods needed
        for inferior function calls to work properly on ia64-hpux.

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