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A linker normally has two stages: symbol resolution and "moving stuff". In lib/Linker there is the complication of lazy linking some globals, but it was still far more mixed than it needed to. This splits the linker into a lower level IRMover and the linker proper. The IRMover just takes a list of globals to move and a callback that lets the user control what is lazy linked. The main motivation is that now tools/gold (and soon lld) can use their own symbol resolution to instruct IRMover what to do. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255254 91177308-0d34-0410-b5e6-96231b3b80d8