Resolve type aliases when looking for default arguments to actual methods.

Change-Id: I059093c1af32fcd7a2de36c25160c352d6f03a3c

compiler/resolution/src/org/jetbrains/kotlin/resolve/multiplatform/ExpectedActualResolver.kt

@@ -50,7 +50,7 @@ object ExpectedActualResolver {
                     // TODO: support non-source definitions (e.g. from Java)
                     actual.source.containingFile != SourceFile.NO_SOURCE_FILE
                 }.groupBy { actual ->
-                    areCompatibleCallables(expected, actual)
+                    areCompatibleCallables(expected, actual, platformModule)
                 }
             }
             is ClassDescriptor -> {
@@ -113,7 +113,9 @@ object ExpectedActualResolver {
                 listOf(module.getPackage(containingDeclaration.fqName).memberScope)
             }
             is ClassDescriptor -> {
-                val classes = containingDeclaration.findClassifiersFromModule(module).filterIsInstance<ClassDescriptor>()
+                val classes = containingDeclaration.findClassifiersFromModule(module)
+                    .mapNotNull { if (it is TypeAliasDescriptor) it.classDescriptor else it }
+                    .filterIsInstance<ClassDescriptor>()
                 if (this is ConstructorDescriptor) return classes.flatMap { it.constructors }
 
                 classes.map { it.unsubstitutedMemberScope }