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Commit be2b5cbf authored by Saleem Abdulrasool's avatar Saleem Abdulrasool
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CodeGen: use `llvm.used` for ObjC protocols 

These symbols are supposed to be preserved even by the linker.  Use the
`llvm.used` to ensure that the symbols are not removed by DCE in the
linker.  This should be a no-op change on MachO since the symbols are
annotated as `no_dead_strip`.

llvm-svn: 323247
parent 6719e241
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