swift234

Drop in the new DottedNameType and wire it up in name binding. 
This is horribly hack and slash (but enough to pass all tests) for a few reasons:
- I've #if 0'd out the tendrils of the old code 
- This handles *just* what was handled before instead of being more general
- We don't have an llvm::MutableArrayRef type, so there is some really gross
  const_cast'ing and other struggles to deal with its absence.



Swift SVN r1050