Dan Zheng a174243159 [AutoDiff upstream] Add SIL differentiability witness IRGen. (#29704) ...

SIL differentiability witnesses are a new top-level SIL construct mapping
an "original" SIL function and derivative configuration to derivative SIL
functions.

This patch adds `SILDifferentiabilityWitness` IRGen.

`SILDifferentiabilityWitness` has a fixed `{ i8*, i8* }` layout:
JVP and VJP derivative function pointers.

Resolves TF-1146.

2020-02-07 14:10:34 -08:00

8.6 KiB

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