Remove isolate pointer from context objects.

runtime/vm/object.h

 // Copyright (c) 2012, 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 VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 4049 matching lines @@
   // So that the RawFunction pointer visitor can determine whether code the
   // function points to is optimized.
   friend class RawFunction;
 };
 
 
 class Context : public Object {
  public:
   RawContext* parent() const { return raw_ptr()->parent_; }
   void set_parent(const Context& parent) const {
-    ASSERT(parent.IsNull() || parent.isolate() == Isolate::Current());
     StorePointer(&raw_ptr()->parent_, parent.raw());
   }
   static intptr_t parent_offset() { return OFFSET_OF(RawContext, parent_); }
 
-  Isolate* isolate() const { return raw_ptr()->isolate_; }
-  static intptr_t isolate_offset() { return OFFSET_OF(RawContext, isolate_); }
-
   intptr_t num_variables() const { return raw_ptr()->num_variables_; }
   static intptr_t num_variables_offset() {
     return OFFSET_OF(RawContext, num_variables_);
   }
 
   RawInstance* At(intptr_t context_index) const {
     return *InstanceAddr(context_index);
   }
   inline void SetAt(intptr_t context_index, const Instance& value) const;
 
@@ skipping 19 matching lines @@
 
   static RawContext* New(intptr_t num_variables,
                          Heap::Space space = Heap::kNew);
 
  private:
   RawInstance* const* InstanceAddr(intptr_t context_index) const {
     ASSERT((context_index >= 0) && (context_index < num_variables()));
     return &raw_ptr()->data()[context_index];
   }
 
-  void set_isolate(Isolate* isolate) const {
-    StoreNonPointer(&raw_ptr()->isolate_, isolate);
-  }
-
   void set_num_variables(intptr_t num_variables) const {
     StoreNonPointer(&raw_ptr()->num_variables_, num_variables);
   }
 
   FINAL_HEAP_OBJECT_IMPLEMENTATION(Context, Object);
   friend class Class;
 };
 
 
 // The ContextScope class makes it possible to delay the compilation of a local
@@ skipping 3428 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_