[stubs] Don't pass name to Load/StoreGlobalViaContext stubs.

src/scopeinfo.cc

 // Copyright 2011 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 <stdlib.h>
 
 #include "src/v8.h"
 
 #include "src/bootstrapper.h"
 #include "src/scopeinfo.h"
@@ skipping 554 matching lines @@
     // Cache as not found. Mode, location, init flag and maybe assigned flag
     // don't matter.
     context_slot_cache->Update(scope_info, name, TEMPORARY,
                                VariableLocation::CONTEXT, kNeedsInitialization,
                                kNotAssigned, -1);
   }
   return -1;
 }
 
 
+String* ScopeInfo::ContextSlotName(int slot_index) {
+  // TODO(bmeurer): Simplify this once we have only a single slot for both reads
+  // and writes to context globals;  currently we have 2 slots per context
+  // global, and these are located after the common context slots (of which we
+  // always have Context::MIN_CONTEXT_SLOTS) and the context locals.
+  int const var =
+      slot_index - (Context::MIN_CONTEXT_SLOTS + ContextLocalCount());
+  DCHECK_LE(0, var);
+  DCHECK_LT(var, 2 * ContextGlobalCount());
+  return ContextLocalName(ContextLocalCount() + var / 2);
+}
+
+
 int ScopeInfo::ParameterIndex(String* name) {
   DCHECK(name->IsInternalizedString());
   if (length() > 0) {
     // We must read parameters from the end since for
     // multiply declared parameters the value of the
     // last declaration of that parameter is used
     // inside a function (and thus we need to look
     // at the last index). Was bug# 1110337.
     int start = ParameterEntriesIndex();
     int end = ParameterEntriesIndex() + ParameterCount();
@@ skipping 261 matching lines @@
     info->set_mode(i, var->mode());
     DCHECK(var->index() >= 0);
     info->set_index(i, var->index());
   }
   DCHECK(i == info->length());
   return info;
 }
 
 }  // namespace internal
 }  // namespace v8