[PATCH] Loop Vectorizer: Refactor code to compute vectorized memory instruction cost

[Arnold Schwaighofer]

This patch introduces a helper class that computes the cost of memory access instructions in 
LoopVectorizationCostModel::getInstructionCost.

Instead of a lot of code inline we have a class that will perform the computation for us.

I defined the member functions of the class inline so that most of code gets inlined and the cost of using a class is minimized.
 
No functionality change intended.

Thanks,
Arnold

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