Unused symbol: do not report for secondary constructor when class is used as typealias

#KT-20907 Fixed

idea/testData/inspectionsLocal/unusedSymbol/secondaryConstructorCalledByTypeAlias.kt

@@ -0,0 +1,10 @@
+// PROBLEM: none
+class A(x: Double) {
+    <caret>constructor(i: Int) : this(i.toDouble())
+}
+
+class C {
+    val a = B(1)
+}
+
+typealias B = A