Initial import of ChangeLowering.

src/unique.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HYDROGEN_UNIQUE_H_
 #define V8_HYDROGEN_UNIQUE_H_
 
 #include "src/handles.h"
 #include "src/objects.h"
 #include "src/string-stream.h"
@@ skipping 156 matching lines @@
 
   // TODO(titzer): this is a hack to migrate to Unique<T> incrementally.
   static PrintableUnique<T> CreateUninitialized(Zone* zone, Handle<T> handle) {
     return PrintableUnique<T>(zone, reinterpret_cast<Address>(NULL), handle);
   }
 
   static PrintableUnique<T> CreateImmovable(Zone* zone, Handle<T> handle) {
     return PrintableUnique<T>(zone, reinterpret_cast<Address>(*handle), handle);
   }
 
-  const char* string() { return string_; }
+  const char* string() const { return string_; }
 
  private:
   const char* string_;
 
   void InitializeString(Zone* zone) {
     // The stringified version of the parameter must be calculated when the
     // Operator is constructed to avoid accessing the heap.
     HeapStringAllocator temp_allocator;
     StringStream stream(&temp_allocator);
     this->handle_->ShortPrint(&stream);
@@ skipping 216 matching lines @@
       }
       capacity_ = new_capacity;
       array_ = new_array;
     }
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_UNIQUE_H_