[AutoDiff][test] Enable previously disabled tests related to issue 55492 (#77759)

A couple of tests were disabled due to crash described in
#55492. Now the crash is fixed
and the issue is resolved, so tests could be enabled.

Author: kovdan01

test/AutoDiff/SILOptimizer/differentiation_diagnostics.swift

@@ -720,12 +720,11 @@ func tupleArrayLiteralInitialization(_ x: Float, _ y: Float) -> Float {
 // Subset parameter differentiation thunks
 //===----------------------------------------------------------------------===//
 
-// FIXME: Non-differentiability diagnostic crash due to invalid source location (https://github.com/apple/swift/issues/55492).
-/*
 func testNoDerivativeParameter(_ f: @differentiable(reverse) (Float, @noDerivative Float) -> Float) -> Float {
+  // expected-error @+2 {{function is not differentiable}}
+  // expected-note @+1 {{cannot differentiate with respect to a '@noDerivative' parameter}}
   return gradient(at: 2) { x in f(x * x, x) }
 }
-*/
 
 // Test parameter subset thunk + partially-applied original function.
 struct TF_675 : Differentiable {

test/AutoDiff/SILOptimizer/forward_mode_diagnostics.swift

@@ -119,12 +119,11 @@ func activeInoutParamMutatingMethod(_ x: Mut) -> Mut {
 // Subset parameter differentiation thunks
 //===----------------------------------------------------------------------===//
 
-// FIXME: Non-differentiability diagnostic crash due to invalid source location (https://github.com/apple/swift/issues/55492).
-/*
 func testNoDerivativeParameter(_ f: @differentiable(reverse) (Float, @noDerivative Float) -> Float) -> Float {
+  // expected-error @+2 {{function is not differentiable}}
+  // expected-note @+1 {{cannot differentiate with respect to a '@noDerivative' parameter}}
   return derivative(at: 2, 3) { (x, y) in f(x * x, y) }
 }
-*/
 
 //===----------------------------------------------------------------------===//
 // Stored property access differentiation