ADT: Save a word in every StringSet entry

ADT: Save a word in every StringSet entry

Add a specialization to StringMap (actually StringMapEntry) for a
value type of NoneType (the type of llvm::None), and use it for
StringSet. This'll save us a word from every entry in a StringSet,
used for alignment with the size_t that stores the string length.

I could have gone all the way to some kind of empty base class
optimization, but that seemed like overkill. Someone can consider
adding that in the future, though.

https://reviews.llvm.org/D68586

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374440 91177308-0d34-0410-b5e6-96231b3b80d8