KT-6671 Report unused constructor parameters

#KT-6671 fixed

compiler/testData/diagnostics/tests/delegatedProperty/genericGetter.kt

@@ -1,6 +1,6 @@
 val a: Int by A(1)
 
-class A<T: Any>(i: T) {
+class A<T: Any>(<!UNUSED_PARAMETER!>i<!>: T) {
   fun get(t: Any?, p: PropertyMetadata): T {
     t.equals(p) // to avoid UNUSED_PARAMETER warning
     throw Exception()