Add Toshiba TX49 support

[Nathan Sidwell]

Hi,

here's an updated patch with typo fixed and using G1, G2 & G3 in mips-opc.c
as suggested.

ok?

nathan
-- 
Dr Nathan Sidwell   ::   http://www.codesourcery.com   ::   CodeSourcery LLC
          'But that's a lie.' - 'Yes it is. What's your point?'
nathan@codesourcery.com : http://www.cs.bris.ac.uk/~nathan/ : nathan@acm.org