Fix Win64 compilation.

src/objects.cc

 // Copyright 2010 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 5949 matching lines @@
       }
     }
     it.next();
   }
   return statement_position;
 }
 
 
 uint8_t* Code::GetSafepointEntry(Address pc) {
   SafepointTable table(this);
-  unsigned pc_offset = pc - instruction_start();
+  unsigned pc_offset = static_cast<unsigned>(pc - instruction_start());
   for (unsigned i = 0; i < table.length(); i++) {
     // TODO(kasperl): Replace the linear search with binary search.
     if (table.GetPcOffset(i) == pc_offset) return table.GetEntry(i);
   }
   return NULL;
 }
 
 
 void Code::SetNoStackCheckTable() {
   // Indicate the absence of a stack-check table by a table start after the
@@ skipping 3764 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal