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

compiler/testData/diagnostics/tests/smartCasts/varInInitializer.fir.kt

@@ -0,0 +1,12 @@
+class My {
+    val x: Int
+    init {
+        var y: Int? = null
+        if (y != null) {
+            x = y.hashCode()
+        }
+        else {
+            x = 0
+        }
+    }
+}