[PATCH] Use NativeReferenceIvarsV2 if necessary.

[Shankar Kalpathi Easwaran]

  NativeFileFormat is one of the formats thats going to be widely used by users and it allows to extend linker capabilities. Currently its not being used as the Reader doesnot consume the NativeFile as one of the input types, in future lld would take in native files as inputs(it already takes in YAML files which is a textual representation of the native files) and I think the plan is to mix native files with regular .o's too.

  I am fine with this approach if we are following an iterative model to handle this, but please wait for other reviewers to comment on it.

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