PSI Pattern Matching: Add equivalence tests for JetPsiUnifier

idea/testData/unifier/equivalence/declarations/classesAndObjects/anonymousObjectBody.kt.match

@@ -0,0 +1,13 @@
+object {
+            val a = 1
+            fun b() = a + 1
+            val c: Int
+                get() = b() + 1
+        }
+
+object {
+            fun b() = a + 1
+            val a = 1
+            val c: Int
+                get() = b() + 1
+        }