Make CTX allocatable by the register allocator.

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 4487 matching lines @@
     return clazz()->ptr()->num_native_fields_;
   }
 
   void SetNativeField(int index, intptr_t value) const;
 
   // Returns true if the instance is a closure object.
   bool IsClosure() const;
 
   // If the instance is a callable object, i.e. a closure or the instance of a
   // class implementing a 'call' method, return true and set the function
-  // (if not NULL) to call and the context (if not NULL) to pass to the
-  // function.
-  bool IsCallable(Function* function, Context* context) const;
+  // (if not NULL) to call.
+  bool IsCallable(Function* function) const;
 
   // Evaluate the given expression as if it appeared in an instance
   // method of this instance and return the resulting value, or an
   // error object if evaluating the expression fails. The method has
   // the formal parameters given in param_names, and is invoked with
   // the argument values given in param_values.
   RawObject* Evaluate(const String& expr,
                       const Array& param_names,
                       const Array& param_values) const;
 
@@ skipping 3030 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_