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

compiler/testData/diagnostics/tests/smartCasts/lambdaAndArgumentFun.fir.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -NOTHING_TO_INLINE
+// See KT-9143: smart cast on a variable nulled inside a lambda argument
+inline fun <T> foo(t1: T, t2: T) = t1 ?: t2
+
+inline fun <T> bar(l: (T) -> Unit): T = null!!
+
+fun use() {
+    var x: Int?
+    x = 5
+    // Write to x is AFTER
+    x.hashCode()
+    // No smart cast should be here!
+    foo(bar { x = null }, x.hashCode())
+}