## Checklist - [x] Reviewed the README and documents. - [x] Searched existing issues for ensure not duplicated. ## Description <!--- Provide a detailed description of the feature you are proposing --> DiffableDataSources should support ARM Macs. ## Motivation and Context <!--- Why is this feature required? What problem does it solve? --> <!--- If it fixes an open issue, please link to the issue here. --> DiffableDataSources currently only gets built for x86_64 for macOS and the Simulator. Now that all new Macs use an ARM CPU, DiffableDataSources should also be built for ARM. ## Proposed Solution <!--- Describe the solution you proposing. -->