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af18e017d2
This used to be free, copying and moving DebugLocs became expensive after the metadata rewrite. Passing by reference eliminates a ton of track/untrack operations. No functionality change intended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272512 91177308-0d34-0410-b5e6-96231b3b80d8