[AutoDiff upstream] Add SIL differentiability witness IRGen. #29704
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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.
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rxwei
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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
SILDifferentiabilityWitnessIRGen.SILDifferentiabilityWitnesshas a fixed{ i8*, i8* }layout:JVP and VJP derivative function pointers.
Resolves TF-1146.