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

compiler/testData/diagnostics/tests/smartCasts/variables/initialization.fir.kt

@@ -0,0 +1,8 @@
+fun foo() {
+    var v: Any = "xyz"
+    // It is possible in principle to provide smart cast here
+    // but now we decide that v is Any
+    v.<!UNRESOLVED_REFERENCE!>length<!>()
+    v = 42
+    v.<!UNRESOLVED_REFERENCE!>length<!>()
+}