Add Toshiba TX49 support

[Nathan Sidwell]

cgd@broadcom.com wrote:
> At Mon, 11 Nov 2002 21:22:06 +0000 (UTC), "Nathan Sidwell" wrote:
> 
>>I picked -m4900 as the cpu flag,
> Err, "we don't do machine flags like that anymore."  (looks like
> you've already set it up to do -march/-mtune.)
I'll check I've got the docs consistent

> Is it really called the r4900 (rather than tx4900)?  If the latter,
> you probably should name it the latter.
It's named constently with toshiba's tx39 variant. I agree tx49 might
be a better name, were it not for that history.

nathan
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