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d3732d9095
The complicated situation is when we have to keep an alias but drop a GV that is part of the aliasee. We used to clone the dropped GV and make the clone internal. This is wasteful as we know the original will be dropped. With this patch what is done instead is set the linkage of the original to internal and replace all uses (but the one in the alias) with a new declaration that takes the name of the old GV. This saves us from having to copy the body. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223863 91177308-0d34-0410-b5e6-96231b3b80d8