[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/controlFlowAnalysis/localClasses.fir.kt

@@ -0,0 +1,26 @@
+package f
+
+fun f() {
+    class LocalClass() {
+        init {
+            val x1 = "" // ok: unused
+
+            fun loc1(): Int {
+                val x1_ = "" // ok: unused
+            }
+        }
+
+        fun f() {
+            val x2 = "" // error: should be UNUSED_VARIABLE
+
+            fun loc2(): Int {
+                val x2_ = "" // error: should be UNUSED_VARIABLE
+            }
+        }
+
+        val v: String
+            get() {
+                val x3 = "" // ok: unused
+            }
+    }
+}