[AutoDiff] Revisit differentiation of struct
instruction with aggregate adjoint value.
#25234
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In the latest Swift, no calls to an initializer will emit a
struct
instruction, so differentiation of thestruct
instruction will only be for differentiating struct initializer functions themselves. In struct initializer functions, since there's only onestruct
operation,AdjointEmitter::visitStructInst
will never get an adjoint value of kindAdjointValueKind::Aggregate
. This PR marks that case unreachable.