Use common.dart to re-export commonly used entities.

pkg/compiler/lib/src/common.dart

Index: pkg/compiler/lib/src/common.dart
diff --git a/pkg/compiler/lib/src/common.dart b/pkg/compiler/lib/src/common.dart
index 400ba5d537947331836fe9ff4884ee6d6942e880..df3ad462af185193a83a702a5345cc33e08563cd 100644
--- a/pkg/compiler/lib/src/common.dart
+++ b/pkg/compiler/lib/src/common.dart
@@ -2,61 +2,24 @@
 // 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 that re-exports libraries used throughout the compiler regardless
+/// of phase or subfunctionality.
 library dart2js.common;
 
-
-export 'common/names.dart' show
-    Names;
-
-export 'common/tasks.dart' show
-    CompilerTask;
-
-export 'compiler.dart' show
-    Compiler;
-
-export 'constants/values.dart' show
-    ConstantValue,
-    InterceptorConstantValue,
-    NullConstantValue,
-    TypeConstantValue;
-
-export 'dart_types.dart' show
-    DartType,
-    FunctionType,
-    InterfaceType,
-    TypeVariableType,
-    Types;
-
+export 'diagnostics/diagnostic_listener.dart' show
+    DiagnosticMessage,
+    DiagnosticReporter;
 export 'diagnostics/invariant.dart' show
+    assertDebugMode,
+    InternalErrorFunction,
     invariant;
-
+export 'diagnostics/messages.dart' show
+    MessageKind;
+export 'diagnostics/source_span.dart' show
+    SourceSpan;
 export 'diagnostics/spannable.dart' show
+    CURRENT_ELEMENT_SPANNABLE,
+    NO_LOCATION_SPANNABLE,
+    Spannable,
     SpannableAssertionFailure;
-
-export 'elements/elements.dart' show
-    ClassElement,
-    CompilationUnitElement,
-    Element,
-    Elements,
-    FunctionElement,
-    FunctionSignature,
-    LibraryElement,
-    MetadataAnnotation,
-    MixinApplicationElement,
-    TypedefElement,
-    VariableElement;
-
-export 'tree/tree.dart' show
-    Node;
-
-export 'types/types.dart' show
-    TypeMask;
-
-export 'universe/call_structure.dart' show
-    CallStructure;
-
-export 'universe/selector.dart' show
-    Selector;
-
-export 'util/util.dart' show
-    Link;
+export 'helpers/helpers.dart';