Move dart2js from sdk/lib/_internal/compiler to pkg/compiler

pkg/compiler/lib/src/universe/function_set.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 part of universe;
 
 // TODO(kasperl): This actually holds getters and setters just fine
 // too and stricly they aren't functions. Maybe this needs a better
 // name -- something like ElementSet seems a bit too generic.
 class FunctionSet {
@@ skipping 216 matching lines @@
             return const TypeMask.empty();
           } else {
             return new TypeMask.nonNullSubclass(cls.declaration, classWorld);
           }
         }),
         classWorld);
   }
 
   FullFunctionSetQuery(functions) : super(functions);
 }