[PATCH] [SelectionDAG] Unary vector constant folding integer legality fixes

[Simon Pilgrim]

In http://reviews.llvm.org/D9282#162777, @ab wrote:

> Is there a way to further reduce the testcase, or even rewrite it from scratch?  I shiver whenever I see autogen ;)
>
> The change LGTM, but you might want to wait for other reviews.


Thanks Ahmed, I'll give it another day to see if anyone else has any comments.

I'll get the test -mcpu fixed - note we need mattr=+avx to force i686 to use xmm registers, otherwise it does a rather messy return of the <4 x float> over the stack which isn't very helpful.


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http://reviews.llvm.org/D9282

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