Introduce some predicates over variable modes.

src/variables.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 102 matching lines @@
   }
 
   bool IsUnallocated() const { return location_ == UNALLOCATED; }
   bool IsParameter() const { return location_ == PARAMETER; }
   bool IsStackLocal() const { return location_ == LOCAL; }
   bool IsStackAllocated() const { return IsParameter() || IsStackLocal(); }
   bool IsContextSlot() const { return location_ == CONTEXT; }
   bool IsLookupSlot() const { return location_ == LOOKUP; }
   bool IsGlobalObjectProperty() const;
 
-  bool is_dynamic() const {
-    return (mode_ == DYNAMIC ||
-            mode_ == DYNAMIC_GLOBAL ||
-            mode_ == DYNAMIC_LOCAL);
-  }
-  bool is_const_mode() const {
-    return (mode_ == CONST ||
-            mode_ == CONST_HARMONY);
-  }
+  bool is_dynamic() const { return IsDynamicVariableMode(mode_); }
+  bool is_const_mode() const { return IsImmutableVariableMode(mode_); }
   bool binding_needs_init() const {
     return initialization_flag_ == kNeedsInitialization;
   }
 
   bool is_this() const { return kind_ == THIS; }
   bool is_arguments() const { return kind_ == ARGUMENTS; }
 
   // True if the variable is named eval and not known to be shadowed.
   bool is_possibly_eval() const {
     return IsVariable(FACTORY->eval_symbol());
@@ skipping 46 matching lines @@
   InitializationFlag initialization_flag_;
 
   // Module type info.
   Interface* interface_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_VARIABLES_H_