PATCH: SelectionDAG: Fix incorrect lowering of CONCAT_VECTOR

[Matt Arsenault]

On 08/08/2014 05:39 PM, Tom Stellard wrote:
> +    // where a build vector has operand types larger than the destination
> +    // element type. e.g. v4i16 = BUILD_VECTOR i32, i32, i32, i32
> +    if (!SrcVT.isVector() && EltVT.bitsLT(SrcVT)) {
Although this comment is sort of misleading since you don't exactly have 
a build_vector typed v4i16 with i32 operands