Re-do the backends

• Re-architect the backend (hopefully for the last time!)
  • CPU backend
  • "RT" backend (generates async-await Rust code to call device functions)
• Supports product, summation, and array types as "memory objects", supports arbitrary addressing (with no implicit clone assumption)
• Unforkify pass, fork split pass (for easier codegen)

requested review from @aaronjc4

assigned to @rarbore2

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• 7ebc4ef0 - Fix unforkify, fix odd juno_matmul test behavior

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• e54f4235 - Fix unforkify, fix odd juno_matmul test behavior

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• bd1c1baa - New tests, clean-up some warnings

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• 47d7956f - New tests, clean-up some warnings

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• a2d43022 - Analyze vector width in CPU backend for constant sized forks

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• bce7eba0 - Remove vector stuff for now

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mentioned in commit 2b96b570

merged