Remove special ArrayLength handling already covered by JSObjectFieldAccessors

src/hydrogen.h

 // Copyright 2012 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 2318 matching lines @@
     }
     Type* type() const { return type_; }
     Handle<String> name() const { return name_; }
 
     bool IsJSObjectFieldAccessor() {
       int offset;  // unused
       return Accessors::IsJSObjectFieldAccessor<Type>(type_, name_, &offset);
     }
 
     bool GetJSObjectFieldAccess(HObjectAccess* access) {
-      if (IsArrayLength()) {
-        *access = HObjectAccess::ForArrayLength(map()->elements_kind());
-        return true;
-      }
       int offset;
       if (Accessors::IsJSObjectFieldAccessor<Type>(type_, name_, &offset)) {
         if (type_->Is(Type::String())) {
           ASSERT(name_->Equals(isolate()->heap()->length_string()));
           *access = HObjectAccess::ForStringLength();
+        } else if (type_->Is(Type::Array())) {
+          ASSERT(name_->Equals(isolate()->heap()->length_string()));
+          *access = HObjectAccess::ForArrayLength(map()->elements_kind());
         } else {
           *access = HObjectAccess::ForMapAndOffset(map(), offset);
         }
         return true;
       }
       return false;
     }
 
     bool has_holder() { return !holder_.is_null(); }
     bool IsLoad() const { return access_type_ == LOAD; }
 
     LookupResult* lookup() { return &lookup_; }
     Handle<JSObject> holder() { return holder_; }
     Handle<JSFunction> accessor() { return accessor_; }
     Handle<Object> constant() { return constant_; }
     Handle<Object> transition() { return transition_; }
     HObjectAccess access() { return access_; }
 
    private:
     Type* ToType(Handle<Map> map) { return builder_->ToType(map); }
     Isolate* isolate() { return lookup_.isolate(); }
     CompilationInfo* current_info() { return builder_->current_info(); }
 
-    bool IsArrayLength() {
-      return map()->instance_type() == JS_ARRAY_TYPE &&
-          name_->Equals(isolate()->heap()->length_string());
-    }
-
     bool LoadResult(Handle<Map> map);
     bool LookupDescriptor();
     bool LookupInPrototypes();
     bool IsCompatible(PropertyAccessInfo* other);
 
     void GeneralizeRepresentation(Representation r) {
       access_ = access_.WithRepresentation(
           access_.representation().generalize(r));
     }
 
@@ skipping 360 matching lines @@
   }
 
  private:
   HGraphBuilder* builder_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_