Dan Zheng c2ac96f09f [AutoDiff upstream] Add SIL transpose function type calculation. (#29755) ...

Add `SILFunctionType::getAutoDiffTransposeFunctionType`.

It computes the transpose `SILFucntionType` for an original `SILFunctionType`,
given:

- Linearity parameter indices
- Transpose function generic signature (optional)
- Other auxiliary parameters

Add doc comments explaining typing rules, preconditions, and other details.
Add `isTranspose` flag to `autodiff::getConstrainedDerivativeGenericSignature`.

Partially resolves TF-1125.
Unblocks TF-1141: upstream `differentiability_witness_function` instruction.

2020-02-11 04:08:25 -08:00

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