re PR c++/14007 (Incorrect use of const partial specialization for reference template...

re PR c++/14007 (Incorrect use of const partial specialization for reference template argument)

cp:
	PR c++/14007
	* pt.c (check_cv_quals_for_unify): Correct logic for disallowed
	cv-qualifier unification.
	* tree.c (cp_build_qualified_type_real): Renable DR295 logic.
testsuite:
	PR c++/14007
	* g++.dg/template/unify5.C: New.
	* g++.dg/template/unify6.C: New.
	* g++.dg/template/qualttp20.C: Adjust.
	* g++.old-deja/g++.jason/report.C: Adjust.
	* g++.old-deja/g++.other/qual1.C: Adjust.

From-SVN: r80351