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

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

@@ -0,0 +1,12 @@
+package c
+
+fun test() {
+    val x = 10
+    fun inner1() {
+        fun inner2() {
+            fun inner3() {
+                val y = x
+            }
+        }
+    }
+}