Benjamin Kramer bdc4956bac Pass DebugLoc and SDLoc by const ref. ...

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.

llvm-svn: 272512

2016-06-12 15:39:02 +00:00

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