FIR2IR: don't generate IrGetObject for anonymous objects

compiler/testData/ir/irText/firProblems/AnnotationLoader.kt

@@ -0,0 +1,32 @@
+interface Visitor {
+    fun visit()
+
+    fun visitArray(): Visitor? = null
+
+    fun visitAnnotation(): Visitor? = null
+}
+
+class AnnotationLoader {
+    fun loadAnnotation(): Visitor? {
+        return object : Visitor {
+            override fun visit() {}
+
+            override fun visitArray(): Visitor? {
+                return object : Visitor {
+                    override fun visit() {
+                        foo()
+                    }
+                }
+            }
+
+            override fun visitAnnotation(): Visitor? {
+                val visitor = loadAnnotation()!!
+                return object : Visitor by visitor {
+                    override fun visit() {}
+                }
+            }
+
+            private fun foo() {}
+        }
+    }
+}