Add "Find Usages" tests for nested/inner classes and objects

idea/testData/findUsages/java/findJavaClassUsages/JKNestedClassAllUsages.1.kt

@@ -0,0 +1,38 @@
+public class X(bar: String? = Outer.A.BAR): Outer.A() {
+    var next: Outer.A? = Outer.A()
+    val myBar: String? = Outer.A.BAR
+
+    {
+        Outer.A.BAR = ""
+        Outer.A.foos()
+    }
+
+    fun foo(a: Outer.A) {
+        val aa: Outer.A = a
+        aa.bar = ""
+    }
+
+    fun getNext(): Outer.A? {
+        return next
+    }
+
+    public override fun foo() {
+        super<Outer.A>.foo()
+    }
+
+    class object: Outer.A() {
+
+    }
+}
+
+object O: Outer.A() {
+
+}
+
+fun X.bar(a: Outer.A = Outer.A()) {
+
+}
+
+fun Any.toA(): Outer.A? {
+    return if (this is Outer.A) this as Outer.A else null
+}