[FIR] Use Throwable as expected type for throw expressions

#KT-58533 Fixed

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/expressions/FirThrowExpression.kt

@@ -32,4 +32,6 @@ abstract class FirThrowExpression : FirExpression() {
     abstract override fun replaceAnnotations(newAnnotations: List<FirAnnotation>)
 
     abstract override fun <D> transformAnnotations(transformer: FirTransformer<D>, data: D): FirThrowExpression
+
+    abstract fun <D> transformException(transformer: FirTransformer<D>, data: D): FirThrowExpression
 }

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/expressions/impl/FirThrowExpressionImpl.kt

@@ -40,7 +40,7 @@ internal class FirThrowExpressionImpl(
     override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirThrowExpressionImpl {
         typeRef = typeRef.transform(transformer, data)
         transformAnnotations(transformer, data)
-        exception = exception.transform(transformer, data)
+        transformException(transformer, data)
         return this
     }
 
@@ -49,6 +49,11 @@ internal class FirThrowExpressionImpl(
         return this
     }
 
+    override fun <D> transformException(transformer: FirTransformer<D>, data: D): FirThrowExpressionImpl {
+        exception = exception.transform(transformer, data)
+        return this
+    }
+
     override fun replaceTypeRef(newTypeRef: FirTypeRef) {
         typeRef = newTypeRef
     }

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/NodeConfigurator.kt

@@ -620,7 +620,7 @@ object NodeConfigurator : AbstractFieldConfigurator<FirTreeBuilder>(FirTreeBuild
         }
 
         throwExpression.configure {
-            +field("exception", expression)
+            +field("exception", expression).withTransform()
         }
 
         variableAssignment.configure {