[rfa:ppc] Make empty registers empty

[Andrew Cagney]

Hello,

The PPC, for some processor variants, has an empty register R0:

#define R0              { 0, 0, 0, 0, 0 }
/* UISA-level SPRs for PowerPC without floating point support.  */
#define PPC_UISA_NOFP_SPRS \
   /* 66 */ R4(cr),  R(lr), R(ctr), R4(xer), R0
/* Motorola e500.  */
static const struct reg registers_e500[] =
{
   R(pc), R(ps),
   /* cr, lr, ctr, xer, "" */
   PPC_UISA_NOFP_SPRS,
   ...
}

The problem is that register_virtual_type for those registers returns 
int32 and, when things are added up, that doesn't agree with 
register_raw_size (aka regsize), et.al.  This makes regcache.[hc] grumpy 
(try 'set architecture powerpc:e500 :-).

The attached adds an empty integer type (for want of a better choice) 
and then modifies register_virtual_type so that it is returned when the 
register is zero.

With this in place it becomes possible (well in theory) to delete all 
the deprecated register * methods.

Ok? GDB 6 branch?

Andrew
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