Fix again HeapEntry size problem, now platform-independent way.

src/profile-generator.h

 // 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 597 matching lines @@
   unsigned type_: 3;
   int children_count_: 27;
   int retainers_count_;
   int self_size_;
   union {
     int ordered_index_;  // Used during dominator tree building.
     int retained_size_;  // At that moment, there is no retained size yet.
   };
   HeapEntry* dominator_;
   HeapSnapshot* snapshot_;
-#ifdef WIN32
   struct Id {
     uint32_t id1_;
     uint32_t id2_;
-  } id_;  // This is to avoid extra padding of 64-bit value on MSVC.
-#else
-  uint64_t id_;
-#endif
+  } id_;  // This is to avoid extra padding of 64-bit value.
   const char* name_;
 
   // Paints used for exact retained sizes calculation.
   static const unsigned kUnpainted = 0;
   static const unsigned kPainted = 1;
   static const unsigned kPaintedReachableFromOthers = 2;
   // Paints used for approximate retained sizes calculation.
   static const unsigned kLeaf = 0;
   static const unsigned kNonLeaf = 1;
   static const unsigned kProcessed = 2;
@@ skipping 438 matching lines @@
   friend class HeapSnapshotJSONSerializerIterator;
 
   DISALLOW_COPY_AND_ASSIGN(HeapSnapshotJSONSerializer);
 };
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 #endif  // V8_PROFILE_GENERATOR_H_