[SLP][NFC]Add ShuffleCostBuilder and generalize BaseShuffleAnalysis::createShuffle function, NFC.

Added basic implementation of ShuffleCostBuilder class in
ShuffleCostEstimator and generalized BaseShuffleAnalysis::createShuffle
function to support emission of Value */InstructionCost for the
vectorization/cost estimation.

Differential Revision: https://reviews.llvm.org/D149171