Reifier hookup

test/dart_codegen/expect/c/c.dart

 library c;
 
 import 'a/a.dart' as DDC$a$;
 import 'package:dev_compiler/runtime/dart_logging_runtime.dart' as DEVC$RT;
 import 'b.dart';
 
 void bar() {
   f3(((__x0) => DEVC$RT.cast(__x0, dynamic, DDC$a$.A, "DynamicCast",
       """line 10, column 6 of test/dart_codegen/types/c.dart: """,
       __x0 is DDC$a$.A, true))(f4(3)));
-  f1(DEVC$RT.cast(f4, __t1, DDC$a$.A2A, "CompositeCast",
+  f1(DEVC$RT.cast(f4, __CastType1, DDC$a$.A2A, "CompositeCast",
       """line 11, column 6 of test/dart_codegen/types/c.dart: """,
       f4 is DDC$a$.A2A, false));
   f2(f3);
 }
-typedef dynamic __t1(dynamic __u2);
+typedef dynamic __CastType1(dynamic __u2);