Dan Zheng 723b2d2cbe [AutoDiff upstream] Add derivative function witness/vtable entry SILGen. (#30569) ...

`@differentiable` attribute on protocol requirements and non-final class
members now produces derivative function entries in witness tables and vtables.

This enables `witness_method` and `class_method` differentiation.

Existing type-checking rules:

- Witness declarations of `@differentiable` protocol requirements must have a
  `@differentiable` attribute with the same configuration (or a configuration
  with superset parameter indices).
  - Witness table derivative function entries are SILGen'd for `@differentiable`
    witness declarations.

- Class vtable derivative function entries are SILGen'd for non-final
  `@differentiable` class members.
  - These derivative entries can be overridden or inherited, just like other
    vtable entries.

Resolves TF-1212.

2020-03-22 16:59:01 -07:00

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