[llvm-dev] ArrayRef vs SmallVectorImpl

[Russell Wallace via llvm-dev]

It is suggested in the documentation that if you would have declared a
function parameter as SmallVector<Foo,N>&, it is better to instead declare
it as SmallVectorImpl<Foo>&.

This makes sense, but it seems to me that it is better still to declare it
as ArrayRef<Foo>; a quick test suggests it compiles to the same (highly
efficient) code, and adds a bit more flexibility in case e.g. you someday
want to pass a std::vector.

By that logic, there is never any reason to take a SmallVectorImpl, because
ArrayRef is strictly better. Am I missing anything?
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