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[AArch64] Implement getArithmeticReductionCost

Description

[AArch64] Implement getArithmeticReductionCost

This patch provides an implementation of getArithmeticReductionCost for
AArch64. We can specialize the cost of add reductions since they are computed
using the 'addv' instruction.

Differential Revision: https://reviews.llvm.org/D44490