Fetch global object from jsproxy prototype instead of embedding it in StoreGlobal.

src/ic/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/base/bits.h"
@@ skipping 1729 matching lines @@
                                               expected_arguments);
       }
       break;
     }
 
     case LookupIterator::DATA: {
       if (lookup->is_dictionary_holder()) {
         if (holder->IsGlobalObject()) {
           Handle<PropertyCell> cell = lookup->GetPropertyCell();
           Handle<HeapType> union_type = PropertyCell::UpdatedType(cell, value);
+          DCHECK(holder.is_identical_to(receiver) ||
+                 receiver->map()->prototype() == *holder);
           StoreGlobalStub stub(isolate(), union_type->IsConstant(),
                                receiver->IsJSGlobalProxy());
           Handle<Code> code = stub.GetCodeCopyFromTemplate(
               Handle<GlobalObject>::cast(holder), cell);
           // TODO(verwaest): Move caching of these NORMAL stubs outside as well.
           HeapObject::UpdateMapCodeCache(receiver, lookup->name(), code);
           return code;
         }
         DCHECK(holder.is_identical_to(receiver));
         return isolate()->builtins()->StoreIC_Normal();
@@ skipping 1240 matching lines @@
 static const Address IC_utilities[] = {
 #define ADDR(name) FUNCTION_ADDR(name),
     IC_UTIL_LIST(ADDR) NULL
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) { return IC_utilities[id]; }
 }
 }  // namespace v8::internal