Add Toshiba TX49 support

[Nathan Sidwell]

Hi
the attached patch adds support for the toshiba TX49 mipsIII variant.
That CPU adds a few additional instructions (also available in other
mips variants). I picked -m4900 as the cpu flag, and picked 0x008b0000
as the magic elf ident, E_MIPS_MACH_4900.

built on i686-pc-linux-gnu, and tested as a cross assembler. ok?

This work has been supported by Wind River Systems

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

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