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

compiler/testData/diagnostics/tests/dataFlowInfoTraversal/kt5182WhenBranches.fir.kt

@@ -0,0 +1,13 @@
+//KT-5182 Data flow info is lost for 'when' branches
+
+open class A
+
+class B: A() {
+    fun foo() = 1
+}
+
+fun foo(a: A) = when {
+    a !is B -> 2
+    true -> a.foo() //'foo' is unresolved, smart cast doesn't work
+    else -> a.foo()
+}