RFA: Make LRA temporarily eliminate addresses before testing constraints

[Matthew Fortune]

> On 2014-06-16, 12:12 PM, Robert Suchanek wrote:
> > Pinging for approval.
> >
> > This part of the patch will be needed for MIPS16. The second part to
> enable
> > LRA in MIPS has been already approved.
> >
> 
>    Sorry, Robert.  I thought you are waiting for some Richard's comment
> (actually he knows the code well and wrote address decoding in rtlanal.c).
> 
>    The patch is ok for me and makes LRA even more portable as it adds a
> new profitable address transformation and the code can be useful for
> other targets too.

Thanks.

Core LRA change committed as: r211802
MIPS LRA committed as: r211805

Matthew