KT-2190 Highlight usages invoked on "throw" or "return" should highlight all exit-points of function

#KT-2190 fixed

idea/testData/exitPoints/localFunction2.kt

@@ -0,0 +1,15 @@
+fun f(a: Int): Int {
+    fun localFun() {
+        return
+    }
+
+    if (a < 5) {
+        return 1
+    }
+    else {
+        <caret>return 2
+    }
+}
+
+//HIGHLIGHTED: return 1
+//HIGHLIGHTED: return 2