[ms1] Add ms2 support

[Nick Clifton]

Hi Nathan,

> this patch adds binutils support for morphotech's ms2 processor. Note 
> that ms1 is not the same as mrisc2 -- the latter is, confusingly, 
> ms1-16-003.
> This adds 6 new instructions (two loop insn and four domain specific ones).

> ok?

Approved - please apply, but...

   1.  Please could you add mention of the support for the new 
architecture to the gas/NEWS file ?

   2.  Current the GAS part of the ms1 port is missing a documentation 
file (gas/doc/c-ms1.texi).  Would you care to write one ?  Then you can 
document the new value for the -march= switch. :-)

Cheers
   Nick