Fix annoying parameter name override warning

Some corner cases still remain: KotlinSignature, propagation, deserialized
delegates to Java interfaces

 #KT-1239 Obsolete
 #KT-1924 In Progress
 #KT-2081 Fixed

compiler/testData/diagnostics/tests/override/parameterNames/changeOnOverrideDiagnostic.kt

@@ -0,0 +1,13 @@
+trait A {
+    fun b(a : Int)
+}
+
+trait B : A {}
+
+class C1 : A {
+    override fun b(<!PARAMETER_NAME_CHANGED_ON_OVERRIDE!>b<!> : Int) {}
+}
+
+class C2 : B {
+    override fun b(<!PARAMETER_NAME_CHANGED_ON_OVERRIDE!>b<!> : Int) {}
+}