[IR] dumpKotlinLike: add testdata for FIR tests

compiler/testData/ir/irText/declarations/annotations/spreadOperatorInAnnotationArguments.fir.kt.txt

@@ -0,0 +1,11 @@
+annotation class A : Annotation {
+  constructor(vararg xs: String) /* primary */
+  val xs: Array<out String>
+    field = xs
+    get
+
+}
+
+@A(xs = ["a", "b"])
+fun test() {
+}