Implement dynamic and void as types exported by core library.

pkg/front_end/lib/src/fasta/builder/builtin_type_builder.dart

Index: pkg/front_end/lib/src/fasta/builder/builtin_type_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/builder/dynamic_type_builder.dart b/pkg/front_end/lib/src/fasta/builder/builtin_type_builder.dart
similarity index 68%
copy from pkg/front_end/lib/src/fasta/builder/dynamic_type_builder.dart
copy to pkg/front_end/lib/src/fasta/builder/builtin_type_builder.dart
index 3933e7c170a97d673dcf4766bc0b0e251bdffaf0..ce8ecc170d8226e50bc96fa48dfa12c24b7f9b34 100644
--- a/pkg/front_end/lib/src/fasta/builder/dynamic_type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/builtin_type_builder.dart
@@ -2,16 +2,17 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library fasta.dynamic_type_builder;
+library fasta.builtin_type_builder;
 
 import 'builder.dart' show LibraryBuilder, TypeBuilder, TypeDeclarationBuilder;
 
-class DynamicTypeBuilder<T extends TypeBuilder, R>
+class BuiltinTypeBuilder<T extends TypeBuilder, R>
     extends TypeDeclarationBuilder<T, R> {
   final R type;
 
-  DynamicTypeBuilder(this.type, LibraryBuilder compilationUnit, int charOffset)
-      : super(null, 0, "dynamic", compilationUnit, charOffset);
+  BuiltinTypeBuilder(
+      String name, this.type, LibraryBuilder compilationUnit, int charOffset)
+      : super(null, 0, name, compilationUnit, charOffset);
 
   R buildType(LibraryBuilder library, List<T> arguments) => type;