Implement "Safe Delete" refactoring for value parameters

idea/testData/safeDelete/deleteValueParameter/kotlinValueParameterWithJava/mixedHierarchy2.kt

@@ -0,0 +1,15 @@
+trait Z {
+    open fun foo(a: Int, b: Int)
+}
+
+open class B: A(), Z {
+    override fun foo(<caret>a: Int, b: Int) {
+
+    }
+}
+
+class C: A() {
+    override fun foo(a: Int, b: Int) {
+
+    }
+}