Recognize GC_PLUGIN_IGNORE() on 'operator new' declarations.

tools/clang/blink_gc_plugin/BlinkGCPlugin.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.
 
 // This clang plugin checks various invariants of the Blink garbage
 // collection infrastructure.
 //
 // Errors are described at:
 // http://www.chromium.org/developers/blink-gc-plugin-errors
 
@@ skipping 1107 matching lines @@
       if (visitor.ContainsInvalidFields(info))
         ReportClassContainsInvalidFields(info, &visitor.invalid_fields());
     }
 
     if (info->IsGCDerived()) {
 
       if (!info->IsGCMixin()) {
         CheckLeftMostDerived(info);
         CheckDispatch(info);
         if (CXXMethodDecl* newop = info->DeclaresNewOperator())
-          ReportClassOverridesNew(info, newop);
+          if (!Config::IsIgnoreAnnotated(newop))
+            ReportClassOverridesNew(info, newop);
         if (info->IsGCMixinInstance()) {
           // Require that declared GCMixin implementations
           // also provide a trace() override.
           if (info->DeclaresGCMixinMethods()
               && !info->DeclaresLocalTraceMethod())
             ReportClassMustDeclareGCMixinTraceMethod(info);
         }
       }
 
       {
@@ skipping 908 matching lines @@
 
  private:
   BlinkGCPluginOptions options_;
 };
 
 }  // namespace
 
 static FrontendPluginRegistry::Add<BlinkGCPluginAction> X(
     "blink-gc-plugin",
     "Check Blink GC invariants");