[Patch] Add TYPE_NAME_IDENTIFIER

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

this is a small clean-up discussed some time ago with Jason. The basic 
idea seems pretty straightforward to me. However, at variance with that 
discussion, I'm not proposing replacing the C++ front-end 
TYPE_IDENTIFIER with the new TYPE_NAME_IDENTIFIER because, as far as I 
can see, that front-end really needs DECL_NAME (TYPE_NAME 
unconditionally. Eg, code like (in error.c):

    case TEMPLATE_TEMPLATE_PARM:
      /* For parameters inside template signature.  */
      if (TYPE_IDENTIFIER (t))
    pp_cxx_tree_identifier (pp, TYPE_IDENTIFIER (t));
      else
    pp_cxx_canonical_template_parameter (pp, t);
      break;

assumes that TYPE_IDENTIFIER is indeed an identifier and that would not 
be necessarily the case in C++ when TYPE_NAME_IDENTIFIER boils down to 
TYPE_NAME itself (in practice, fails like eg, abi/mangle12.C, where 
TYPE_NAME is a TEMPLATE_DECL).

Tested x86_64-linux without Ada (I'm asking the help of the maintainers 
about testing those simple bits)

Thanks!
Paolo.

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