[AArch64] Add scheduling and cost models for Exynos M1

[Evandro Menezes]

This patch adds the scheduling and cost models for Exynos M1.

Though it’s a rather large patch, much of it is the DFA model for the
pipeline.  Still, I’d appreciate any feedback.

Please, commit if it’s alright.

Thank you,

-- 
Evandro Menezes

0001-AArch64-Add-scheduling-and-cost-models-for-Exynos-M1.patch
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