>> Although this patch removes isSigned() calls and is correct, it is  
>> not
>> optimal. It is still using CastInst::getCastOpcode to figure out the
>> casting opcode for it. Perhaps someone with a little more  
>> knowledge of
>> the intrinsic functions could narrow these down to the appropriate  
>> cast
>> opcode.

This is fine.  When the whole patch lands, please ping evan.  Most of  
those casts are obviously bitcasts (vector -> vector).

-Chris
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