PATCH: add a c'tor to ErrorOr that allows us to perform two user defined conversions

[Nick Lewycky via llvm-commits]

The attached patch changes ErrorOr to make this code:

  ErrorOr<string> test() { return "literal"; }

work. Without this patch it fails because it would require two user-defined
conversions in a row. Please review!

I'm not sure whether it's correct to describe this as "perfect forwarding"?

Nick
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