llvm patch

[Matt Arsenault]

> On Jul 23, 2015, at 10:51 PM, Jan Hranac <hranac at codasip.com> wrote:
> 
> The attached patch fixes loss of chaining in ExpandUnalignedLoad for legal (but unaligned) vectors and floats. The function was returning an input chain, not an output one in that case.
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LGTM