== turned into a safe-call

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

@@ -1,12 +1,13 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
 val Int.a by Delegate(<!NO_THIS!>this<!>)
 
 class A {
   val Int.a by Delegate(<!TYPE_MISMATCH!>this<!>)
 }
 
-class Delegate(<!UNUSED_PARAMETER!>i<!>: Int) {
+class Delegate(i: Int) {
   fun get(t: Any?, p: PropertyMetadata): Int {
-    t.equals(p) // to avoid UNUSED_PARAMETER warning
     return 1
   }
 }