[runtime] Replace global object link with native context link in all contexts.

src/interpreter/bytecode-generator.cc

 // Copyright 2015 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/interpreter/bytecode-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/interpreter/control-flow-builders.h"
 #include "src/objects.h"
@@ skipping 1765 matching lines @@
   } else if (expr->expression()->IsVariableProxy()) {
     // Delete of an unqualified identifier is allowed in sloppy mode but is
     // not allowed in strict mode. Deleting 'this' is allowed in both modes.
     VariableProxy* proxy = expr->expression()->AsVariableProxy();
     Variable* variable = proxy->var();
     DCHECK(is_sloppy(language_mode()) || variable->HasThisName(isolate()));
     switch (variable->location()) {
       case VariableLocation::GLOBAL:
       case VariableLocation::UNALLOCATED: {
         // Global var, let, const or variables not explicitly declared.
+        Register native_context = execution_result()->NewRegister();
         Register global_object = execution_result()->NewRegister();
         builder()
             ->LoadContextSlot(execution_context()->reg(),
-                              Context::GLOBAL_OBJECT_INDEX)
+                              Context::NATIVE_CONTEXT_INDEX)
+            .StoreAccumulatorInRegister(native_context)
+            .LoadContextSlot(native_context, Context::EXTENSION_INDEX)
             .StoreAccumulatorInRegister(global_object)
             .LoadLiteral(variable->name())
             .Delete(global_object, language_mode());
         break;
       }
       case VariableLocation::PARAMETER:
       case VariableLocation::LOCAL:
       case VariableLocation::CONTEXT: {
         // Deleting local var/let/const, context variables, and arguments
         // does not have any effect.
@@ skipping 425 matching lines @@
 }
 
 
 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const {
   return info()->feedback_vector()->GetIndex(slot);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8