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

pkg/compiler/lib/src/ssa/ssa.dart

Index: pkg/compiler/lib/src/ssa/ssa.dart
diff --git a/pkg/compiler/lib/src/ssa/ssa.dart b/pkg/compiler/lib/src/ssa/ssa.dart
deleted file mode 100644
index c5559d5b245ec6d5c6f51f1bd5c9b0b0a8d5ab1e..0000000000000000000000000000000000000000
--- a/pkg/compiler/lib/src/ssa/ssa.dart
+++ /dev/null
@@ -1,45 +0,0 @@
-// 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.
-
-library ssa;
-
-import 'dart:collection';
-
-import '../closure.dart';
-import '../constants/expressions.dart';
-import '../constants/values.dart';
-import '../deferred_load.dart' show DeferredLoadTask;
-import '../dart2jslib.dart' hide Selector, TypedSelector;
-import '../dart_types.dart';
-import '../elements/elements.dart';
-import '../elements/modelx.dart'
-    show ElementX,
-         VariableElementX,
-         ConstructorBodyElementX;
-import '../js/js.dart' as js;
-import '../js_backend/js_backend.dart';
-import '../js_emitter/js_emitter.dart' show CodeEmitterTask;
-import '../native/native.dart' as native;
-import '../scanner/scannerlib.dart'
-    show PartialFunctionElement, Token, PLUS_TOKEN;
-import '../source_file.dart';
-import '../source_map_builder.dart';
-import '../tree/tree.dart' as ast;
-import '../types/types.dart';
-import '../universe/universe.dart';
-import '../util/util.dart';
-
-part 'builder.dart';
-part 'codegen.dart';
-part 'codegen_helpers.dart';
-part 'interceptor_simplifier.dart';
-part 'invoke_dynamic_specializers.dart';
-part 'nodes.dart';
-part 'optimize.dart';
-part 'types.dart';
-part 'types_propagation.dart';
-part 'validate.dart';
-part 'variable_allocator.dart';
-part 'value_range_analyzer.dart';
-part 'value_set.dart';