getOperandsScalarizationOverhead()

[Jonas Paulsson via llvm-commits]

Hi,

while writing CostModel tests for SystemZ, I needed to fix 
getOperandsScalarizationOverhead() so that it can handle vector argument 
types. This is what is passed to it from CostModel, when the default 
implementation is used for the cost evaluation.

I also added a check not to count an undef operand to extraction costs.

/Jonas



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