Fix parent and containingFile for throws-reference list

Otherwise, exception is thrown during type inference
because default implementations effectively return null

^KT-29287 Fixed

idea/testData/kotlinAndJavaChecker/javaAgainstKotlin/ThrowsOnGenericMethod.kt

@@ -0,0 +1,9 @@
+package foo;
+import java.io.IOException
+
+class A {
+    @Throws(IOException::class)
+    fun <E> foo(y: E) {}
+}
+
+// ALLOW_AST_ACCESS