Anton Korobeynikov c89e270b7d Implement value witness table for @differentiable functions (#60875) ...

@differentiable function is actually a triple (function, jvp, vjp). Previously normal thick function value witness table was used. As a result, for example,  only function was copied, but none of differential components.

This was the cause of uninitialized memory accesses and subsequent segfaults.

Should fix now unavailable TF-1122

2022-09-01 03:09:39 -07:00

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