Revert "VM: [Kernel] elide parent context setup if it's empty"

runtime/vm/kernel_to_il.h

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_KERNEL_TO_IL_H_
 #define RUNTIME_VM_KERNEL_TO_IL_H_
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 
 #include "vm/growable_array.h"
@@ skipping 851 matching lines @@
   Fragment TranslateFinallyFinalizers(TryFinallyBlock* outer_finally,
                                       intptr_t target_context_depth);
 
   Fragment TranslateFunctionNode(FunctionNode* node, TreeNode* parent);
 
   Fragment EnterScope(TreeNode* node, bool* new_context = NULL);
   Fragment ExitScope(TreeNode* node);
 
   Fragment LoadContextAt(int depth);
   Fragment AdjustContextTo(int depth);
-  bool HasContextScope() const;
 
   Fragment PushContext(int size);
   Fragment PopContext();
 
   Fragment LoadInstantiatorTypeArguments();
   Fragment LoadFunctionTypeArguments();
   Fragment InstantiateType(const AbstractType& type);
   Fragment InstantiateTypeArguments(const TypeArguments& type_arguments);
   Fragment TranslateInstantiatedTypeArguments(
       const TypeArguments& type_arguments);
@@ skipping 266 matching lines @@
 namespace kernel {
 
 RawObject* EvaluateMetadata(const dart::Field& metadata_field);
 RawObject* BuildParameterDescriptor(TreeNode* const kernel_node);
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_TO_IL_H_