Show call sites of overriden members in "Caller Hierarchy"

#KT-4395 Fixed

idea/testData/hierarchy/calls/callers/kotlinFunction/KotlinFunction_verification.xml

@@ -1,12 +1,12 @@
 <node text="KA.foo(String)  ()" base="true">
-  <node text="KClientObj  ()"/>
-  <node text="JA.foo()  ()"/>
-  <node text="packageFun(String)  ()"/>
-  <node text="KClient  ()"/>
-  <node text="KClient  ()"/>
-  <node text="bar.localFun()  ()"/>
-  <node text="KClient.bar()  ()"/>
-  <node text="KClient.bar  ()"/>
-  <node text="main0.kt  ()"/>
-  <node text="JA  ()"/>
+  <node text="JA(2 usages)  ()"/>
+  <node text="JA.foo()(2 usages)  ()"/>
+  <node text="KClient(2 usages)  ()"/>
+  <node text="KClient(2 usages)  ()"/>
+  <node text="KClient.bar()(2 usages)  ()"/>
+  <node text="KClient.bar(2 usages)  ()"/>
+  <node text="KClientObj(2 usages)  ()"/>
+  <node text="bar.localFun()(2 usages)  ()"/>
+  <node text="main0.kt(2 usages)  ()"/>
+  <node text="packageFun(String)(2 usages)  ()"/>
 </node>

idea/testData/hierarchy/calls/callers/kotlinFunction/main0.kt

@@ -1,31 +1,37 @@
-class KA {
-    val name = "A"
-    fun <caret>foo(s: String): String = "A: $s"
+open class KBase {
+    open fun foo(s: String): String = s
 }
 
-fun packageFun(s: String): String = KA().foo(s)
+class KA: KBase() {
+    val name = "A"
+    override fun <caret>foo(s: String): String = "A: $s"
+}
 
-val packageVal = KA().foo("")
+fun packageFun(s: String): String = KBase().foo("") + KA().foo(s)
+
+val packageVal = KBase().foo("") + KA().foo("")
 
 class KClient {
     {
         KA().foo("")
+        KBase().foo("")
     }
 
     class object {
-        val a = KA().foo("")
+        val a = KBase().foo("") + KA().foo("")
     }
 
     val bar: String
-        get() = KA().foo("")
+        get() = KBase().foo("") + KA().foo("")
 
     fun bar() {
-        fun localFun() = KA().foo("")
+        fun localFun() = KBase().foo("") + KA().foo("")
 
         KA().foo("")
+        KBase().foo("")
     }
 }
 
 object KClientObj {
-    val a = KA().foo("")
+    val a = KBase().foo("") + KA().foo("")
 }

idea/testData/hierarchy/calls/callers/kotlinFunction/main1.java

@@ -1,7 +1,7 @@
 class JA {
-    public String name = new KA().foo("");
+    public String name = new KBase().foo("") + new KA().foo("");
 
     public String foo() {
-        return new KA().foo("");
+        return new KBase().foo("") + new KA().foo("");
     }
 }