Rename KernelElementAdapter and element_adapter.dart to IrToElementMap and ir_map.dart

pkg/compiler/lib/src/kernel/element_map.dart

 // Copyright (c) 2017, 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.kernel.element_map;
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 13 matching lines @@
 import '../js_backend/constant_system_javascript.dart';
 import '../js_backend/native_data.dart';
 import '../js_backend/no_such_method_registry.dart';
 import '../native/native.dart' as native;
 import '../native/resolver.dart';
 import '../ordered_typeset.dart';
 import '../ssa/kernel_impact.dart';
 import '../universe/call_structure.dart';
 import '../universe/world_builder.dart';
 import '../util/util.dart' show Link, LinkBuilder;
-import 'element_adapter.dart';
+import 'ir_element_map.dart';
 import 'elements.dart';
 
 part 'native_basic_data.dart';
 part 'no_such_method_resolver.dart';
 part 'types.dart';
 
 /// Element builder used for creating elements and types corresponding to Kernel
 /// IR nodes.
-class KernelToElementMap extends KernelElementAdapterMixin {
+class KernelToElementMap extends IrToElementMapMixin {

[Siggi Cherem (dart-lang), 2017/05/05 18:04:21]

so far we use "Kernel" to refer to the Ir everywhere, so how about this:
- IrToElementMap => KernelToElementMap
- IrToElementMapMixin => KernelToElementMapMixin
- KernelToElementMap (this class) => KernelToElementMapImpl

[Johnni Winther, 2017/05/08 08:39:00]

I like that. Adding Impl also indicates that it should not be used as an
interface.

   final Environment _environment;
   CommonElements _commonElements;
   native.BehaviorBuilder _nativeBehaviorBuilder;
   final DiagnosticReporter reporter;
   ElementEnvironment _elementEnvironment;
   DartTypeConverter _typeConverter;
   KernelConstantEnvironment _constantEnvironment;
   _KernelDartTypes _types;
 
   /// Library environment. Used for fast lookup.
@@ skipping 1248 matching lines @@
   }
 
   InterfaceType getMixinTypeForClass(KClass cls) {
     _KClassEnv env = elementMap._classEnvs[cls.classIndex];
     ir.Supertype mixedInType = env.cls.mixedInType;
     if (mixedInType == null) return null;
     return elementMap.createInterfaceType(
         mixedInType.classNode, mixedInType.typeArguments);
   }
 }