Duncan P. N. Exon Smith d640962656 IR: Add MDLocation class
Add a new subclass of `UniquableMDNode`, `MDLocation`.  This will be the
IR version of `DebugLoc` and `DILocation`.  The goal is to rename this
to `DILocation` once the IR classes supersede the `DI`-prefixed
wrappers.

This isn't used anywhere yet.  Part of PR21433.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225824 91177308-0d34-0410-b5e6-96231b3b80d8
2015-01-13 20:44:56 +00:00
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