Chandler Carruth a809f28956 [ADT] Add a default constructor and a bool conversion to function_ref. ...

The internal representation has a natural way to handle this and it
seems nicer than having to wrap this in an optional (with its own
separate flag).

This also matches how std::function works.

llvm-svn: 307490

2017-07-09 06:12:56 +00:00

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