GC plugin: consider references equal to raw pointers.

tools/clang/blink_gc_plugin/RecordInfo.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "Config.h"
 #include "RecordInfo.h"
 
 using namespace clang;
 using std::string;
 
@@ skipping 574 matching lines @@
     GetFields();
 
   return fields_need_tracing_;
 }
 
 Edge* RecordInfo::CreateEdge(const Type* type) {
   if (!type) {
     return 0;
   }
 
-  if (type->isPointerType()) {
+  if (type->isPointerType() || type->isReferenceType()) {
     if (Edge* ptr = CreateEdge(type->getPointeeType().getTypePtrOrNull()))
-      return new RawPtr(ptr, false);
+      return new RawPtr(ptr, false, type->isReferenceType());
     return 0;
   }
 
   RecordInfo* info = cache_->Lookup(type);
 
   // If the type is neither a pointer or a C++ record we ignore it.
   if (!info) {
     return 0;
   }
 
   TemplateArgs args;
 
   if (Config::IsRawPtr(info->name()) && info->GetTemplateArgs(1, &args)) {
     if (Edge* ptr = CreateEdge(args[0]))
-      return new RawPtr(ptr, true);
+      return new RawPtr(ptr, true, false);
     return 0;
   }
 
   if (Config::IsRefPtr(info->name()) && info->GetTemplateArgs(1, &args)) {
     if (Edge* ptr = CreateEdge(args[0]))
       return new RefPtr(ptr);
     return 0;
   }
 
   if (Config::IsOwnPtr(info->name()) && info->GetTemplateArgs(1, &args)) {
@@ skipping 41 matching lines @@
         edge->members().push_back(member);
       }
       // TODO: Handle the case where we fail to create an edge (eg, if the
       // argument is a primitive type or just not fully known yet).
     }
     return edge;
   }
 
   return new Value(info);
 }