KT-5182 Data flow info is lost for 'when' branches

#KT-5158 Fixed
  #KT-4332 Fixed

compiler/testData/diagnostics/tests/dataFlowInfoTraversal/kt5182WhenBranches.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 -> <!DEBUG_INFO_AUTOCAST!>a<!>.foo() //'foo' is unresolved, smart cast doesn't work
+    else -> <!DEBUG_INFO_AUTOCAST!>a<!>.foo()
+}