FIR: Support checking PRIVATE_TO_THIS visibility #KT-49875 Fixed

compiler/testData/diagnostics/tests/variance/privateToThis/SetVar.fir.kt

@@ -15,19 +15,19 @@ class Test<in I, out O> {
         this.i = getT()
         with(Test<I, O>()) {
             i = getT() // resolved to this@Test.i
-            this.i = getT()
-            this@with.i = getT()
+            this.<!INVISIBLE_REFERENCE!>i<!> = getT()
+            this@with.<!INVISIBLE_REFERENCE!>i<!> = getT()
             this@Test.i  = getT()
         }
     }
 
     fun <I, O> test(t: Test<I, O>) {
-        t.i = getT()
+        t.<!INVISIBLE_REFERENCE!>i<!> = getT()
     }
 
     companion object {
         fun <I, O> test(t: Test<I, O>) {
-            t.i = getT()
+            t.<!INVISIBLE_REFERENCE!>i<!> = getT()
         }
     }
 }