r175705 - Use None rather than Optional<T>() where possible.

[Jordan Rose]

On Feb 20, 2013, at 17:47 , David Blaikie <dblaikie at gmail.com> wrote:

> +// None.h includes an enumerant that is desired & cannot be forward declared
> +// without a definition of NoneType.
> +#include "llvm/ADT/None.h"

"enumerant" is a cute word. The standards term for the values of an enumeration type, though, is "enumerator".

Thanks again for all the migration/cleanup work.
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