[patch/mips] Use unwind in mips_get_saved_register

[Andrew Cagney]

Hello,

The attached is ``two steps forward, one step back'' patch.

It modifies mips_get_saved_register() so that it uses the new unwind 
code.  The new unwind code automatically handles the fetching of 
registers in dummy-frames.  Unfortunatly, the change doesn't fix the 
problem of the MIPS fiddling memory register reads dependant on the 
current ABI.

I think, over all it is a step forward though.  It at least helps to 
make it possible to convert the MIPS to generic dummy frames.

-o32 -64 and -n32 all show no regressions.

committed,
Andrew
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