[RFA] mips 32/64 register/stack fix

[Andrew Cagney]

> Andrew Cagney wrote:
> 
>> See daniel's follow up:
> 
> 
> OK, well, FYI, I ran the testsuite with your revised patch, and it
> introduced a bunch of new fails in the whole callfuncs family, along
> with some other completely unexpected places (ptype???).

Remember, my patch was an un-tested guess.  You'll want to debug it a 
little, but the theory is sound.

Andrew