re PR c++/69481 (ICE with C++11 alias using with templates)

re PR c++/69481 (ICE with C++11 alias using with templates)

	cp/
	PR c++/69481
	* cp-tree.h (TYPE_TEMPLATE_INFO): Remove alias type checking.
	(TYPE_ALIAS_TEMPLATE_INFO): New.
	(TYPE_TEMPLATE_INFO_MAYBE_ALIAS): New.  Use those macros.
	* error.c (dump_alias_template_specialization): Adjust.
	* pt.c (maybe_process_partial_specialization)
	iterative_has_template_arg, find_parameter_packs_r,
	alias_template_specialization_p, dependent_alias_template_spec_p,
	get_underlying_template, lookup_template_class_1, unify): Adjust
	template using decl access.

	testsuite/
	PR c++/69481
	* g++.dg/cpp0x/pr69481.C: New.
(--This line, and those below, will be ignored--

M    gcc/testsuite/ChangeLog
A    gcc/testsuite/g++.dg/cpp0x/pr69481.C
M    gcc/cp/cp-tree.h
M    gcc/cp/error.c
M    gcc/cp/ChangeLog
M    gcc/cp/pt.c

From-SVN: r243624