Avoid generating VariableUse nodes with non-identifier names

sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.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 js_backend;
 
 class NativeEmitter {
 
   CodeEmitterTask emitter;
   CodeBuffer nativeBuffer;
@@ skipping 21 matching lines @@
         nativeMethods = new Set<FunctionElement>(),
         nativeBuffer = new CodeBuffer();
 
   Compiler get compiler => emitter.compiler;
   JavaScriptBackend get backend => compiler.backend;
 
   String get _ => emitter.space;
   String get n => emitter.n;
   String get N => emitter.N;
 
-  String get dynamicName {
-    Element element = compiler.findHelper('dynamicFunction');
-    return backend.namer.isolateAccess(element);
-  }
-
-  String get dynamicFunctionTableName {
-    Element element = compiler.findHelper('dynamicFunctionTable');
-    return backend.namer.isolateAccess(element);
-  }
-
-  String get typeNameOfName {
-    Element element = compiler.findHelper('getTypeNameOf');
-    return backend.namer.isolateAccess(element);
-  }
-
   jsAst.Expression get defPropFunction {
     Element element = compiler.findHelper('defineProperty');
     return backend.namer.elementAccess(element);
   }
 
-  String get toStringHelperName {
-    Element element = compiler.findHelper('toStringForNativeObject');
-    return backend.namer.isolateAccess(element);
-  }
-
-  String get hashCodeHelperName {
-    Element element = compiler.findHelper('hashCodeForNativeObject');
-    return backend.namer.isolateAccess(element);
-  }
-
-  String get dispatchPropertyNameVariable {
-    Element element = compiler.findInterceptor('dispatchPropertyName');
-    return backend.namer.isolateAccess(element);
-  }
-
   /**
    * Writes the class definitions for the interceptors to [mainBuffer].
    * Writes code to associate dispatch tags with interceptors to [nativeBuffer].
    *
    * The interceptors are filtered to avoid emitting trivial interceptors.  For
    * example, if the program contains no code that can distinguish between the
    * numerous subclasses of `Element` then we can pretend that `Element` is a
    * leaf class, and all instances of subclasses of `Element` are instances of
    * `Element`.
    *
@@ skipping 401 matching lines @@
       if (emitter.compiler.enableMinification) targetBuffer.add(';');
       targetBuffer.add(jsAst.prettyPrint(
           new jsAst.ExpressionStatement(init), compiler));
       targetBuffer.add('\n');
     }
 
     targetBuffer.add(nativeBuffer);
     targetBuffer.add('\n');
   }
 }