[IR] dumpKotlinLike: add testdata for FIR tests

compiler/testData/ir/irText/expressions/arrayAugmentedAssignment2.fir.kt.txt

@@ -0,0 +1,17 @@
+interface IA {
+  abstract operator fun get(index: String): Int
+
+}
+
+interface IB {
+  abstract operator fun IA.set(index: String, value: Int)
+
+}
+
+fun IB.test(a: IA) {
+  { // BLOCK
+    val <<array>>: IA = a
+    val <<index_0>>: String = ""
+    (<this>, <<array>>).set(index = <<index_0>>, value = <<array>>.get(index = <<index_0>>).plus(other = 42))
+  }
+}