[PATCH] Fix PR18054

[Michael Liao]

Kindly ping with patch reattached. - Michael

On Mon, 2013-11-25 at 01:29 -0800, Michael Liao wrote:
> Hi All,
> 
> The attached patch fixed PR18054 which is caused by a bug in X86
> sign_extend_inreg lowering. Extra checking the in-reg type is needed as
> (vsext x) is only when x is a vector type of i8, i16, or i32. If x is a
> vector type of i1, is not valid to use (vsext x) alone.
> 
> Thanks for review
> - Michael
> 
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