Fix 64-bit VS2010 build

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 169 matching lines @@
   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);
     SmartArrayPointer<const char> desc_string = stream.ToCString();
     const char* desc_chars = desc_string.get();
-    int length = strlen(desc_chars);
+    int length = static_cast<int>(strlen(desc_chars));
     char* desc_copy = zone->NewArray<char>(length + 1);
     memcpy(desc_copy, desc_chars, length + 1);
     string_ = desc_copy;
   }
 };
 
 
 template <typename T>
 class UniqueSet V8_FINAL : public ZoneObject {
  public:
@@ skipping 203 matching lines @@
       }
       capacity_ = new_capacity;
       array_ = new_array;
     }
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_UNIQUE_H_