c++: access of dtor named by qualified template-id [PR100918]

c++: access of dtor named by qualified template-id [PR100918]

Here, when resolving the destructor named by Inner<int>::~Inner<int>
(which is valid until C++20) we end up in cp_parser_lookup_name called
indirectly from cp_parser_template_id to look up the name Inner from
the scope Inner<int>.  The lookup naturally finds the injected-class-name,
and because the flag is_template is true, we adjust this lookup result
to the TEMPLATE_DECL Inner.  We then check access of this adjusted
lookup result.  But this access check fails because the lookup scope is
Inner<int> and the context_for_name_lookup for the TEMPLATE_DECL is
Outer (whereas for the injected-class-name it's also Inner<int>).

The simplest fix seems to be to check access of the original lookup
result (the injected-class-name) instead of the adjusted result (the
TEMPLATE_DECL).  So this patch moves the access check in
cp_parser_lookup_name to before the injected-class-name adjustment.

	PR c++/100918

gcc/cp/ChangeLog:

	* parser.c (cp_parser_lookup_name): Check access of the lookup
	result before we potentially adjust an injected-class-name to
	its TEMPLATE_DECL.

gcc/testsuite/ChangeLog:

	* g++.dg/template/access38.C: New test.