[PATCH] Added more insertps optimizations

[Filipe Cabecinhas]

Hi Andrea,

Wouldn't the tablegen patterns be problematic when we use the load result
several times?
If we use it several times, then we shouldn't generate additional loads. Or
do you think it doesn't matter since they should be close together, since
we're generating for one BB only?

That was the reasoning behind doing it with code and guarding them with
MayFoldLoad, which includes hasOneUse().

I'll add the AVX tests today.

  Filipe

http://reviews.llvm.org/D3581