blink_gc_plugin: disallow WeakMember<> fields in off-heap objects.

tools/clang/blink_gc_plugin/BlinkGCPluginConsumer.cpp

 // Copyright 2015 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 "BlinkGCPluginConsumer.h"
 
 #include <algorithm>
 #include <set>
 
 #include "CheckDispatchVisitor.h"
@@ skipping 177 matching lines @@
 
   // Check polymorphic classes that are GC-derived or have a trace method.
   if (info->record()->hasDefinition() && info->record()->isPolymorphic()) {
     // TODO: Check classes that inherit a trace method.
     CXXMethodDecl* trace = info->GetTraceMethod();
     if (trace || info->IsGCDerived())
       CheckPolymorphicClass(info, trace);
   }
 
   {
-    CheckFieldsVisitor visitor;
+    CheckFieldsVisitor visitor(options_);
     if (visitor.ContainsInvalidFields(info))
       reporter_.ClassContainsInvalidFields(info, visitor.invalid_fields());
   }
 
   if (info->IsGCDerived()) {
     // It is illegal for a class to be both stack allocated and garbage
     // collected.
     if (info->IsStackAllocated()) {
       for (auto& base : info->GetBases()) {
         RecordInfo* base_info = base.second.info();
@@ skipping 505 matching lines @@
   SourceLocation spelling_location = source_manager.getSpellingLoc(loc);
   PresumedLoc ploc = source_manager.getPresumedLoc(spelling_location);
   if (ploc.isInvalid()) {
     // If we're in an invalid location, we're looking at things that aren't
     // actually stated in the source.
     return false;
   }
   *filename = ploc.getFilename();
   return true;
 }