[PATCH] Introduce llvm/ADT/OptionSet.h utility class

[Argyrios Kyrtzidis via llvm-commits]

Hi all,

The attached patch introduces ‘OptionSet’ in llvm/ADT headers, which is a utility class that makes it convenient to work with enumerators representing bit options.

We have found it useful in the swift repo (https://github.com/apple/swift/blob/master/include/swift/Basic/OptionSet.h) and I think it will be useful to other llvm projects as well.

Let me know if you think it is ok to commit in llvm repo.

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