dart2js: Refactoring, documentation, and a few bugfixes in Namer class.

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

 // Copyright (c) 2013, 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.tracer;
 
 import 'dart:async' show EventSink;
 
 import 'ssa.dart';
 import '../js_backend/js_backend.dart';
@@ skipping 271 matching lines @@
     String receiver = temporaryId(node.receiver);
     String index = temporaryId(node.index);
     String value = temporaryId(node.value);
     return "IndexAssign: $receiver[$index] = $value";
   }
 
   String visitInterceptor(HInterceptor node) {
     String value = temporaryId(node.inputs[0]);
     if (node.interceptedClasses != null) {
       JavaScriptBackend backend = compiler.backend;
-      String cls = backend.namer.getInterceptorSuffix(node.interceptedClasses);
+      String cls =
+          backend.namer.suffixForGetInterceptor(node.interceptedClasses);
       return "Intercept ($cls): $value";
     }
     return "Intercept: $value";
   }
 
   String visitInvokeClosure(HInvokeClosure node)
       => visitInvokeDynamic(node, "closure");
 
   String visitInvokeDynamic(HInvokeDynamic invoke, String kind) {
     String receiver = temporaryId(invoke.receiver);
@@ skipping 210 matching lines @@
   }
 
   String visitInterfaceType(HInterfaceType node) {
     return "InterfaceType: ${node.dartType}";
   }
 
   String visitDynamicType(HDynamicType node) {
     return "DynamicType";
   }
 }