Reid Kleckner 680266ef56 [ADT] Add drop_front method to ArrayRef
We have it for StringRef but not ArrayRef, and ArrayRef has drop_back,
so I see no reason it shouldn't have drop_front. Splitting this out of a
change that I have that will use this funcitonality.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268434 91177308-0d34-0410-b5e6-96231b3b80d8
2016-05-03 20:53:20 +00:00
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