search java direct inheritors using javac indices (initial)

java/java-tests/testData/compiler/bytecodeReferences/testHierarchy/FooImpl.java

@@ -0,0 +1,9 @@
+class FooImpl extends Foo {
+
+  void m() {
+    Foo f = new Foo() {
+
+    };
+  }
+
+}