Light Classes: Track original declaration for Kotlin light fields

#KT-4902 Fixed

idea/testData/findUsages/kotlin/findPropertyUsages/javaClassObjectPropertyUsages.0.kt

@@ -0,0 +1,9 @@
+// PSI_ELEMENT: org.jetbrains.jet.lang.psi.JetProperty
+// OPTIONS: usages
+package server;
+
+class A {
+    class object {
+        var <caret>foo: String = "foo"
+    }
+}

idea/testData/findUsages/kotlin/findPropertyUsages/javaClassObjectPropertyUsages.1.java

@@ -0,0 +1,12 @@
+package client;
+
+import server.*
+
+class Client {
+    fun fooBar() {
+        A.object$.setFoo("a");
+        A.foo = "a";
+        println("a.foo = " + A.object$.getFoo());
+        println("a.foo = " + A.foo);
+    }
+}

idea/testData/findUsages/kotlin/findPropertyUsages/javaClassObjectPropertyUsages.results.txt

@@ -0,0 +1,4 @@
+Unclassified usage (10: 32) println("a.foo = " + A.foo);
+Unclassified usage (7: 19) A.object$.setFoo("a");
+Unclassified usage (8: 11) A.foo = "a";
+Unclassified usage (9: 40) println("a.foo = " + A.object$.getFoo());