Support actualization of expect sealed class with typealias in CliSealedClassInheritorsProvider

compiler/testData/diagnostics/tests/multiplatform/exhaustiveness/expectSealedClassWithActualTypealias.kt

@@ -0,0 +1,25 @@
+// FIR_IDENTICAL
+// !LANGUAGE: +MultiPlatformProjects
+// ISSUE: KT-45796
+// SKIP_TXT
+
+// MODULE: m1-common
+expect sealed class SealedClass()
+
+class Derived1 : SealedClass()
+
+// MODULE: m1-jvm(m1-common)
+actual typealias SealedClass = MySealedClass
+
+sealed class MySealedClass
+
+class Derived2 : SealedClass()
+class Derived3 : MySealedClass()
+
+fun whenForSealed(s: SealedClass): Int {
+    return when (s) { // Should be OK
+        is Derived1 -> 1
+        is Derived2 -> 2
+        is Derived3 -> 3
+    }
+}