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Summary: This patch changes the ODR resolution and internalization to be based on updates to the Index, which are consumed by the backend portion of the transformations. It will be followed by an NFC change to move these out of libLTO's ThinLTOCodeGenerator so that it can be used by other linkers (gold and lld) and by ThinLTO distributed backends. The global summary-based portions use callbacks so that the client can determine the prevailing copy and other information in a client-specific way. Eventually, with the API being developed in D20268, these may be modified to use information such as symbol resolutions, supplied by the clients to the API. Reviewers: joker-eph Subscribers: joker.eph, pcc, llvm-commits Differential Revision: http://reviews.llvm.org/D20290 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270584 91177308-0d34-0410-b5e6-96231b3b80d8