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

[Argyrios Kyrtzidis via llvm-commits]

Sorry about that, I became a bit concerned this was inconsequential enough that people would not really care to provide feedback.

> On Feb 11, 2016, at 11:26 PM, David Blaikie <dblaikie at gmail.com> wrote:
> 
> It's generally considered poor form to commit something without review, after asking for it... 
> 
> On Thu, Feb 11, 2016 at 6:54 PM, Argyrios Kyrtzidis via llvm-commits <llvm-commits at lists.llvm.org <mailto:llvm-commits at lists.llvm.org>> wrote:
> I’ve took the liberty of committing in r260652, since this is general goodness and doesn’t affect existing code.
> 
> > On Feb 10, 2016, at 9:23 PM, Argyrios Kyrtzidis <kyrtzidis at apple.com <mailto:kyrtzidis at apple.com>> wrote:
> >
> > 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 <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.
> >
> > <optionset.patch>
> 
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