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

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

@@ -0,0 +1,5 @@
+class AnonymousInitializers(var a: String) {
+    init {
+        a = "s"
+    }
+}