rewrite functional expression search to use stub index

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/findUsages/ConstructorReferences.java

@@ -4,6 +4,13 @@ class Foo {
   Foo(I i) {}
 }
 
+enum SomeEnum {
+  FOO(() -> 5);
+
+  SomeEnum(I i) {
+  }
+}
+
 interface <caret>I {
   int foo();
 }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/findUsages/MethodWithClassTypeParameter.java

@@ -0,0 +1,13 @@
+interface I {
+  void hmmm();
+}
+
+class Test<T extends I> {
+
+  void someUnlikelyName(T action) {
+  }
+
+  {
+    someUnlikelyName(() -> {});
+  }
+}