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

pkg/compiler/lib/src/js_emitter/new_emitter/emitter.dart

-// Copyright (c) 2014, 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 dart2js.new_js_emitter.emitter;
-
-import '../model.dart';
-import 'model_emitter.dart';
-import '../../common.dart';
-import '../../js/js.dart' as js;
-
-import '../../js_backend/js_backend.dart' show Namer, JavaScriptBackend;
-import '../../js_emitter/js_emitter.dart' as emitterTask show
-    CodeEmitterTask,
-    Emitter;
-
-class Emitter implements emitterTask.Emitter {
-  final Compiler _compiler;
-  final Namer namer;
-  final ModelEmitter _emitter;
-
-  Emitter(Compiler compiler, Namer namer)
-      : this._compiler = compiler,
-        this.namer = namer,
-        _emitter = new ModelEmitter(compiler, namer);
-
-  void emitProgram(Program program) {
-    _emitter.emitProgram(program);
-  }
-
-  // TODO(floitsch): copied from OldEmitter. Adjust or share.
-  bool isConstantInlinedOrAlreadyEmitted(ConstantValue constant) {
-    if (constant.isFunction) return true;    // Already emitted.
-    if (constant.isPrimitive) return true;   // Inlined.
-    if (constant.isDummy) return true;       // Inlined.
-    // The name is null when the constant is already a JS constant.
-    // TODO(floitsch): every constant should be registered, so that we can
-    // share the ones that take up too much space (like some strings).
-    if (namer.constantName(constant) == null) return true;
-    return false;
-  }
-
-  // TODO(floitsch): copied from OldEmitter. Adjust or share.
-  int compareConstants(ConstantValue a, ConstantValue b) {
-    // Inlined constants don't affect the order and sometimes don't even have
-    // names.
-    int cmp1 = isConstantInlinedOrAlreadyEmitted(a) ? 0 : 1;
-    int cmp2 = isConstantInlinedOrAlreadyEmitted(b) ? 0 : 1;
-    if (cmp1 + cmp2 < 2) return cmp1 - cmp2;
-
-    // Emit constant interceptors first. Constant interceptors for primitives
-    // might be used by code that builds other constants.  See Issue 18173.
-    if (a.isInterceptor != b.isInterceptor) {
-      return a.isInterceptor ? -1 : 1;
-    }
-
-    // Sorting by the long name clusters constants with the same constructor
-    // which compresses a tiny bit better.
-    int r = namer.constantLongName(a).compareTo(namer.constantLongName(b));
-    if (r != 0) return r;
-    // Resolve collisions in the long name by using the constant name (i.e. JS
-    // name) which is unique.
-    return namer.constantName(a).compareTo(namer.constantName(b));
-  }
-
-  js.Expression generateEmbeddedGlobalAccess(String global) {
-    // TODO(floitsch): We should not use "init" for globals.
-    return js.string("init.$global");
-  }
-
-  js.Expression constantReference(ConstantValue value) {
-    return _emitter.constantEmitter.reference(value);
-  }
-
-  void invalidateCaches() {}
-}