swift234

Abolish the old attribute syntax for type attributes (and SIL type attrs)

- Change type attribute printing logic (in astprinter and the demangler) 
  to print in the new syntax
- Change the swift parser to only accept type attributes in the new syntax.
- Update canParseTypeTupleBody to lookahead over new-syntax type attributes.
- Update the testsuite to use the new syntax.



Swift SVN r9273