PING: Don't reload PLUS expr within subreg matched by match_operator

[Adam Nemet]

Richard Sandiford writes:
> Adam, your original patch:
> 
>     http://gcc.gnu.org/ml/gcc-patches/2008-08/msg01898.html
> 
> is OK to install, thanks.  Sorry for leading you down a blind alley here.

No problem at all and thanks for the approval.  I checked it in after
bootstrapping and regtesting the patch again on
mips64octeon-unknown-linux-gnu.  It's r140556.

Adam