marcrasi f6562d3a67 [AutoDiff upstream] differentiable function conversion pipeline (#30660) ...

Add the `@differentiable` function conversion pipeline:

- New expressions that convert between `@differentiable`,
  `@differentiable(linear)`, and non-`@differentiable` functions:
  - `DifferentiableFunction`
  - `LinearFunction`
  - `DifferentiableFunctionExtractOriginal`
  - `LinearFunctionExtractOriginal`
  - `LinearToDifferentiableFunction`
- All the AST handling (e.g. printing) necessary for those expressions.
- SILGen for those expressions.
- CSApply code that inserts these expressions to implicitly convert between
  the various function types.
- Sema tests for the implicit conversions.
- SILGen tests for the SILGen of these expressions.

Resolves TF-833.

2020-03-27 01:27:39 -07:00

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