Change SortAndUniqueProtocols to operate directly on a SmallVector rather than...

Change SortAndUniqueProtocols to operate directly on a SmallVector rather than taking a pointer and element count that it modifies. This paves the way to directly convert the small vector into an ArrayRef without needing to explicitly pass the modified size. No functional change intended.

While there also use a range-based for loop and use append instead of insert to copy elements into the empty SmallVector."

llvm-svn: 250971