IDEA-169269 "Analyze dataflow to here" should process only implementations of current class when analyzing return values for a method call in instance method

java/java-tests/testData/codeInsight/slice/backward/SearchOverriddenMethodsInThisClassHierarchy.java

@@ -0,0 +1,21 @@
+interface I {
+    String getValue();
+}
+
+abstract class X implements I {
+    void foo() {
+        String <caret>s = <flown1>getValue();
+    }
+}
+
+class Y implements I {
+    public String getValue() {
+        return "Y";
+    }
+}
+
+class Impl extends X {
+    public String getValue() {
+        return <flown11>"Impl";
+    }
+}