ADT: Add a drop_back() helper to ArrayRef

The slice(N, M) interface is powerful but not concise when wanting to
drop a few elements off of an ArrayRef, fix this by adding a drop_back
method.

llvm-s

ADT: Add a drop_back() helper to ArrayRef

The slice(N, M) interface is powerful but not concise when wanting to
drop a few elements off of an ArrayRef, fix this by adding a drop_back
method.

llvm-svn: 212370

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Fix layering StringRef copy using BumpPtrAllocator.

Now to copy a string into a BumpPtrAllocator and get a StringRef to the copy:

StringRef myCopy = myStr.copy(myAllocator);


llvm-svn: 200885