[c++-concepts] template parameter constraints

[Andrew Sutton]

I added a new macro to replace the use of TREE_TYPE to get
constraints. It's called TEMPLATE_PARMS_CONSTRAINTS. Patch attached:

2013-09-10  Andrew Sutton  <andrew.n.sutton@gmail.com>
    * gcc/cp/cp-tree.h (TEMPLATE_PARMS_CONSTRAINTS): New.
    * gcc/cp/parser.c (cp_parser_template_declaration_after_export),
        (cp_parser_type_parameter): Use TEMPLATE_PARMS_CONSTRAINTS.
    * gcc/cp/semantics.c (fixup_template_scope): Use
         TEMPLATE_PARMS_CONSTRAINTS.


Andrew Sutton
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