Rvalue references for *this:

  - Add ref-qualifiers to the type system; they are part of the
  canonical type. Print & profile ref-qualifiers
  - Translate the ref-qualifier from the Declarator chunk for
    functions to the function type. 
  - Diagnose mis-uses of ref-qualifiers w.r.t. static member
  functions, free functions, constructors, destructors, etc.
  - Add serialization and deserialization of ref-qualifiers.

llvm-svn: 124281