Add regression test for #59467 (#60158)

* Add S4TF crasher test
* Unbreak the test

Co-authored-by: Philip Turner <philipturner.AR@gmail.com>

Resolves #59467

Author: asl

test/AutoDiff/compiler_crashers_fixed/59467-failed-to-reconstruct-type.swift

@@ -0,0 +1,24 @@
+// RUN: %target-swift-frontend -emit-ir -g -primary-file %s %S/Inputs/59467-failed-to-reconstruct-type-second.swift -module-name TensorFlow
+
+import _Differentiation
+
+@_semantics("autodiff.nonvarying")
+func withoutDerivative() -> Tensor {
+  fatalError()
+}
+
+func BatchNorm_doInference(
+  _ input: Tensor
+) -> Tensor {
+  withoutDerivative()
+}
+
+@differentiable(reverse)
+func BatchNorm_callAsFunction(_ input: Tensor) -> Tensor {
+  BatchNorm_doInference(input)
+}
+
+@differentiable(reverse)
+func LayerNorm_callAsFunction(_ input: Tensor) -> Tensor {
+  rsqrt(input)
+}

test/AutoDiff/compiler_crashers_fixed/Inputs/59467-failed-to-reconstruct-type-second.swift

@@ -0,0 +1,19 @@
+import _Differentiation
+
+struct Tensor: Differentiable {}
+
+// `Tensor` could be defined in this test case's primary file and the crash
+// would still happen. All that matters is that `LayerNorm_callAsFunction` and
+// `rsqrt` are defined in separate files.
+
+@differentiable(reverse)
+func rsqrt( _ x: Tensor) -> Tensor {
+  fatalError()
+}
+
+@derivative(of: rsqrt)
+func _vjpRsqrt(_ x: Tensor) -> (
+  value: Tensor, pullback: (Tensor.TangentVector) -> (Tensor.TangentVector)
+) {
+  fatalError()
+}