[IR] dumpKotlinLike: add testdata for FIR tests

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

@@ -0,0 +1,12 @@
+fun test() {
+  val x: IntArray = intArrayOf(elements = [1, 2, 3])
+  x.set(index = 1, value = 0)
+}
+
+fun foo(): Int {
+  return 1
+}
+
+fun test2() {
+  intArrayOf(elements = [1, 2, 3]).set(index = foo(), value = 1)
+}