Call method references search in UnusedSymbolInspection.hasReferences to fix secondary constructor search

Makes #KT-12500 Fixed
Makes #KT-12501 Fixed

idea/testData/inspections/unusedSymbol/function/delegatedSecondaryConstructor.kt

@@ -0,0 +1,20 @@
+class CtorUsedByOtherCtor {
+    constructor()
+
+    constructor(p: String): this()
+}
+
+open class CtorUsedParent {
+    constructor()
+}
+
+class CtorUsedChild : CtorUsedParent {
+    constructor() : super()
+}
+
+@test.anno.EntryPoint
+fun use(): Int {
+    val first = CtorUsedByOtherCtor("")
+    val second = CtorUsedChild(true)
+    return first.hashCode() + second.hashCode()
+}

idea/testData/inspections/unusedSymbol/function/usedInJava.java

@@ -2,4 +2,9 @@ class RandomJavaClass {
     void g() {
         foo.UsedInJavaKt.usedInJava();
     }
+
+    public void context() {
+        foo.Ctor c = new foo.Ctor(0);
+        c.justCompare();
+    }
 }

idea/testData/inspections/unusedSymbol/function/usedInJava.kt

@@ -1,4 +1,9 @@
 package foo
 
 fun usedInJava() {
-}
+}
+
+class Ctor {
+    constructor(p: Int)
+    fun justCompare() {}
+}