Control Flow: Fix CFG usage info for double-colon expressions

#KT-12551 Fixed
 #KT-17092 Fixed

compiler/testData/diagnostics/tests/callableReference/bound/controlFlow.kt

@@ -1,7 +1,6 @@
 fun unusedExpression(s: String) {
-    // TODO: report UNUSED_EXPRESSION (KT-12551)
-    s::hashCode
-    s::class
+    <!UNUSED_EXPRESSION!>s::hashCode<!>
+    <!UNUSED_EXPRESSION!>s::class<!>
 }
 
 fun noUnusedParameter(s: String): Int {
@@ -10,13 +9,13 @@ fun noUnusedParameter(s: String): Int {
 }
 
 fun unreachableCode(): Int {
-    (if (true) return 1 else return 0)::toString
+    (if (true) return 1 else return 0)<!UNREACHABLE_CODE!>::toString<!>
     <!UNREACHABLE_CODE!>return 0<!>
 }
 
 fun unreachableCodeInLoop(): Int {
     while (true) {
-        (break)::toString
+        (break)<!UNREACHABLE_CODE!>::toString<!>
         <!UNREACHABLE_CODE!>return 1<!>
     }
     return 2