Fix generic signature of FunctionN type visible from Java

compiler/testData/codegen/box/functions/bigArity/callFromJava.kt

@@ -0,0 +1,36 @@
+// !LANGUAGE: +FunctionTypesWithBigArity
+// WITH_RUNTIME
+// TARGET_BACKEND: JVM
+// FILE: J.java
+
+import kotlin.jvm.functions.FunctionN;
+
+public class J {
+    public static String test() {
+        return KKt.call(new FunctionN<String>() {
+            @Override
+            public String invoke(Object... args) {
+                if (args.length != getArity()) throw new IllegalArgumentException("Incorrect arity: " + args.length);
+
+                return ((A) args[5]).getMessage() +
+                        ((A) args[28]).getMessage();
+            }
+
+            @Override
+            public int getArity() {
+                return 30;
+            }
+        });
+    }
+}
+
+// FILE: K.kt
+
+class A(val message: String)
+
+fun call(f: (A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A) -> String): String {
+    val a = A("XXX")
+    return f(a, a, a, a, a, A("O"), a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, A("K"), a)
+}
+
+fun box(): String = J.test()