reverting a LRA change

[Vladimir Makarov]

It seems one my yesterday patch created problems with mode switching:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58679

I reverted it until further investigation (committed as rev. 204094).  
Sorry for inconvenience.

2013-10-26  Vladimir Makarov  <vmaka...@redhat.com>

        Revert:
        2013-10-25  Vladimir Makarov <vmaka...@redhat.com>
        * lra-spills.c (lra_final_code_change): Remove useless move insns.