CFG: provide "used as expression" in enum constant constructor

This allows to avoid
"unused return value of a function with lambda expression body"
for such a situation
So #KT-20429 Fixed

compiler/frontend/src/org/jetbrains/kotlin/cfg/ControlFlowProcessor.kt

@@ -1447,6 +1447,14 @@ class ControlFlowProcessor(private val trace: BindingTrace) {
             generateCallOrMarkUnresolved(call)
         }
 
+        override fun visitInitializerList(list: KtInitializerList) {
+            list.initializers
+                    .filterIsInstance<KtSuperTypeCallEntry>()
+                    .forEach {
+                        generateCallOrMarkUnresolved(it)
+                    }
+        }
+
         private fun generateCallOrMarkUnresolved(call: KtCallElement) {
             if (!generateCall(call)) {
                 val arguments = call.valueArguments.mapNotNull(ValueArgument::getArgumentExpression)