Swift: extract UnreachableExpr

Author: redsun82

Diff for: swift/extractor/infra/SwiftTagTraits.h

@@ -176,7 +176,7 @@ MAP(swift::Expr, ExprTag)
     MAP(swift::LinearToDifferentiableFunctionExpr, LinearToDifferentiableFunctionExprTag)
     MAP(swift::ABISafeConversionExpr, AbiSafeConversionExprTag)  // different acronym convention
     MAP(swift::ActorIsolationErasureExpr, ActorIsolationErasureExprTag)
-    MAP(swift::UnreachableExpr, void)  // TODO swift 6.0
+    MAP(swift::UnreachableExpr, UnreachableExprTag)
   MAP(swift::ExplicitCastExpr, ExplicitCastExprTag)
     MAP(swift::CheckedCastExpr, CheckedCastExprTag)
       MAP(swift::ForcedCheckedCastExpr, ForcedCheckedCastExprTag)

Diff for: swift/ql/.generated.list

@@ -1457,3 +1457,9 @@ class ActorIsolationErasureExpr(ImplicitConversionExpr):
     A conversion that erases the actor isolation of an expression with `@isolated(any)` function
     type.
     """
+
+
+class UnreachableExpr(ImplicitConversionExpr):
+    """
+    A conversion from the uninhabited type to any other type. It's never evaluated.
+    """