Make ClassMirror.newInstance deal with reordered etc type arguments for redirecting factories.

tests/lib/mirrors/redirecting_factory_test.dart

Index: tests/lib/mirrors/redirecting_factory_test.dart
diff --git a/tests/lib/mirrors/redirecting_factory_test.dart b/tests/lib/mirrors/redirecting_factory_test.dart
index 1d0059faf28026e28d871a6ca0f866d2bd2ec04e..65090697b1ea1513d25a49a3314b162aea752459 100644
--- a/tests/lib/mirrors/redirecting_factory_test.dart
+++ b/tests/lib/mirrors/redirecting_factory_test.dart
@@ -14,14 +14,14 @@ class Class<T1, T2> {
   factory Class.redirectingFactoryNoOptional(a, b) = Class.factoryNoOptional;
 
   factory Class.factoryUnnamedOptional(a, [b = 42]) => new Class<T1, T2>(a - b);
-  factory Class.redirectingFactoryUnnamedOptional(a, [b]) =
+  factory Class.redirectingFactoryUnnamedOptional(a, [b = 5]) =
       Class.factoryUnnamedOptional;
 
-  factory Class.factoryNamedOptional(a, {b: 0}) {
+  factory Class.factoryNamedOptional(a, {b: 42}) {
     return new Class<T1, T2>(a - b);
   }
 
-  factory Class.redirectingFactoryNamedOptional(a, {b: 42}) =
+  factory Class.redirectingFactoryNamedOptional(a, {b: 5}) =
       Class.factoryNamedOptional;
 
   factory Class.factoryMoreNamedOptional(a, {b: 0, c: 2}) {