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

compiler/testData/diagnostics/testsWithStdLib/inference/integerLiterals.fir.kt

@@ -0,0 +1,24 @@
+// !LANGUAGE: +NewInference
+// !WITH_NEW_INFERENCE
+// !DIAGNOSTICS: -USELESS_ELVIS -UNUSED_EXPRESSION
+
+class X {
+    fun toLong(): Long? = TODO()
+}
+
+fun getLong(): Long = TODO()
+
+fun test_1(list: List<X>) {
+    val props = list.map { it.toLong() ?: 0 }
+    props
+}
+
+fun test_2(cond: Boolean) {
+    val props = if (cond) getLong() else 0
+    props
+}
+
+fun test_3(list: List<X>) {
+    val props = list.map { Pair(it.toLong() ?: 0, it.toLong() ?: 0) }
+    props
+}