Restore performance of accesses to JSGlobalProxy after r22802

src/ic.cc

 // Copyright 2012 the V8 project 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 "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/codegen.h"
@@ skipping 193 matching lines @@
         return;
       case LookupIterator::INTERCEPTOR: {
         // If there is a getter, return; otherwise loop to perform the lookup.
         Handle<JSObject> holder = it->GetHolder<JSObject>();
         if (!holder->GetNamedInterceptor()->getter()->IsUndefined()) {
           return;
         }
         break;
       }
       case LookupIterator::ACCESS_CHECK:
+        // PropertyHandlerCompiler::CheckPrototypes() knows how to emit
+        // access checks for global proxies.
+        if (it->GetHolder<JSObject>()->IsJSGlobalProxy() &&
+            it->HasAccess(v8::ACCESS_GET)) {
+          break;
+        }
         return;
       case LookupIterator::PROPERTY:
         if (it->HasProperty()) return;  // Yay!
         break;
     }
   }
 }
 
 
 bool IC::TryRemoveInvalidPrototypeDependentStub(Handle<Object> receiver,
@@ skipping 2837 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal