[MIPS] Change madd/maddu/msub/msubu/mult/multu to DSP rev1

[Maciej W. Rozycki]

On Thu, 28 Oct 2010, Richard Sandiford wrote:

> No problem.  I think we've all been there :-)  On the plus side,
> it means your patch doesn't in fact need a testcase, unless you're
> keen to add one (or have written one already).

 Yes, I'm keen to add something twisted, as usually. ;)  I should be able 
to get back at this either tomorrow or late today.  And I'll be sending 
more stuff to address issues we have recently discussed as I've got most 
of this stuff done already -- it's just some t's to cross and i's to dot 
that I have got left, I believe.

  Maciej