[PATCH] Write references to Native format in NativeReferenceIvarsV2.

[Shankar Kalpathi Easwaran]

  The targetIndex should be 32bits in NativeReferenceIvarsV1. This should fix it I assume right ?

  I am not sure why the compiler is not issuing a warning of using a lower type on the lhs versus a higher type used with the map with typedef llvm::DenseMap<const Atom*, uint32_t> TargetToIndex, function getTargetIndex.

  May be there was a different reason of having the V2 struct ?

http://llvm-reviews.chandlerc.com/D2217