Handle correctly a very ugly part of the C++ syntax. We cannot disambiguate...

Handle correctly a very ugly part of the C++ syntax. We cannot disambiguate between a parenthesized type-id and
a paren expression without considering the context past the parentheses.

Behold:
  (T())x;  - type-id
  (T())*x; - type-id
  (T())/x; - expression
  (T());   - expression

llvm-svn: 72260