[patch i386 4.4/trunk]: Fix sse restore for x86_64 in case of !sp_valid

[Jan Hubicka]

> Well, you are right. It can't get != 0 when no sseregs are present.
> But well, it doesn't hurt here to check for it, as it isn't part of
> to_allocate.

Yep, the original idea was to keep it there basically for the case that
someone invents new use for it.  So for 4.4 we won't need any patch,
right?

Honza
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