SSE fix 4 (PR target/7386)

[Jan Hubicka]

> When you checked this patch into the mainline, you also
> checked in a patch to ix86_memory_move_cost, which I can't
> find in the ChangeLog or the CVS log.
> 
> Is this an x86-64 patch?
Yes, however I didn't intended to check in this way.
I guess I left it in my CVS and missed that later.
I've announced that I will do obvious checking, so I will add the
ChangeLog in next commit to proper place and hope that will fix the bug.

Honza
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