Reviewed-by: Roberto Raggi

Fixes function argument list code completion not completing the cv
qualifier.

Regression from 9efa5d94.

Task-number: QTCREATORBUG-1037
Reviewed-by: Roberto Raggi

For example:
    template <typename ::foo::bar>...

Done by: Roberto Raggi
Reviewed-by: erikv

For example,
  template <template <typename> class X> struct foo {};

Reviewed-by: erikv

The check should be done in the semantic phase.