Remove some unnecessary binding initialization checks.

src/scopeinfo.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 27 matching lines @@
 // Cache for mapping (data, property name) into context slot index.
 // The cache contains both positive and negative results.
 // Slot index equals -1 means the property is absent.
 // Cleared at startup and prior to mark sweep collection.
 class ContextSlotCache {
  public:
   // Lookup context slot index for (data, name).
   // If absent, kNotFound is returned.
   int Lookup(Object* data,
              String* name,
-             VariableMode* mode);
+             VariableMode* mode,
+             InitializationFlag* init_flag);
 
   // Update an element in the cache.
   void Update(Object* data,
               String* name,
               VariableMode mode,
+              InitializationFlag init_flag,
               int slot_index);
 
   // Clear the cache.
   void Clear();
 
   static const int kNotFound = -2;
 
  private:
   ContextSlotCache() {
     for (int i = 0; i < kLength; ++i) {
       keys_[i].data = NULL;
       keys_[i].name = NULL;
       values_[i] = kNotFound;
     }
   }
 
   inline static int Hash(Object* data, String* name);
 
 #ifdef DEBUG
   void ValidateEntry(Object* data,
                      String* name,
                      VariableMode mode,
+                     InitializationFlag init_flag,
                      int slot_index);
 #endif
 
   static const int kLength = 256;
   struct Key {
     Object* data;
     String* name;
   };
 
   struct Value {
-    Value(VariableMode mode, int index) {
+    Value(VariableMode mode,
+          InitializationFlag init_flag,
+          int index) {
       ASSERT(ModeField::is_valid(mode));
+      ASSERT(InitField::is_valid(init_flag));
       ASSERT(IndexField::is_valid(index));
-      value_ = ModeField::encode(mode) | IndexField::encode(index);
+      value_ = ModeField::encode(mode) |
+          IndexField::encode(index) |
+          InitField::encode(init_flag);
       ASSERT(mode == this->mode());
+      ASSERT(init_flag == this->initialization_flag());
       ASSERT(index == this->index());
     }
 
     explicit inline Value(uint32_t value) : value_(value) {}
 
     uint32_t raw() { return value_; }
 
     VariableMode mode() { return ModeField::decode(value_); }
 
+    InitializationFlag initialization_flag() {
+      return InitField::decode(value_);
+    }
+
     int index() { return IndexField::decode(value_); }
 
     // Bit fields in value_ (type, shift, size). Must be public so the
     // constants can be embedded in generated code.
-    class ModeField:  public BitField<VariableMode, 0, 3> {};
-    class IndexField: public BitField<int,          3, 32-3> {};
+    class ModeField:  public BitField<VariableMode,       0, 3> {};
+    class InitField:  public BitField<InitializationFlag, 3, 1> {};
+    class IndexField: public BitField<int,                4, 32-4> {};
+
    private:
     uint32_t value_;
   };
 
   Key keys_[kLength];
   uint32_t values_[kLength];
 
   friend class Isolate;
   DISALLOW_COPY_AND_ASSIGN(ContextSlotCache);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPEINFO_H_