Adding dwarf2 regnum mapping

[Michal Ludvig]

Daniel Jacobowitz wrote:
> mn10300-tdep.c:  set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum);
> s390-tdep.c:  set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
> 
> Do it just like either of those; set it in i386_gdbarch_init.

My fault, of course. I tried this, but by mistake I used 
gdbarch_dwarf_reg... instead of gdbarch_dwarf2_reg... and was wondering 
why it doesn't work. So I finally asked here for the trick. Of course if 
I use the _right_ set function it works :-)

Michal Ludvig
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