Make CTX allocatable by the register allocator.

runtime/vm/parser.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_PARSER_H_
 #define VM_PARSER_H_
 
 #include "include/dart_api.h"
 
 #include "platform/assert.h"
@@ skipping 107 matching lines @@
   }
   void set_finally_return_temp_var(LocalVariable* value) {
     ASSERT(!has_finally_return_temp_var());
     finally_return_temp_var_ = value;
   }
   bool has_finally_return_temp_var() const {
     return finally_return_temp_var_ != NULL;
   }
   void EnsureFinallyReturnTemp();
 
-  static LocalVariable* CreateExpressionTempVar(intptr_t token_pos);
   LocalVariable* EnsureExpressionTemp();
+  LocalVariable* EnsureSavedCurrentContext();
 
   bool HasDeferredPrefixes() const { return deferred_prefixes_->length() != 0; }
   ZoneGrowableArray<const LibraryPrefix*>* deferred_prefixes() const {
     return deferred_prefixes_;
   }
   void AddDeferredPrefix(const LibraryPrefix& prefix);
 
   int first_parameter_index() const { return first_parameter_index_; }
   int first_stack_local_index() const { return first_stack_local_index_; }
   int num_copied_params() const { return num_copied_params_; }
@@ skipping 586 matching lines @@
                                   const Function* func);
 
   void SetupSavedTryContext(LocalVariable* saved_try_context);
   void RestoreSavedTryContext(LocalScope* saved_try_context_scope,
                               int16_t try_index,
                               SequenceNode* target);
 
   void CheckOperatorArity(const MemberDesc& member);
 
   void EnsureExpressionTemp();
+  void EnsureContextVar();
   void EnsureSavedCurrentContext();
   bool IsLegalAssignableSyntax(AstNode* expr, intptr_t end_pos);
   AstNode* CreateAssignmentNode(AstNode* original,
                                 AstNode* rhs,
                                 const String* left_ident,
                                 intptr_t left_pos);
   AstNode* InsertClosureCallNodes(AstNode* condition);
 
   ConstructorCallNode* CreateConstructorCallNode(
       intptr_t token_pos,
@@ skipping 67 matching lines @@
   bool unregister_pending_function_;
 
   LocalScope* async_temp_scope_;
 
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 }  // namespace dart
 
 #endif  // VM_PARSER_H_