re PR c++/84582 (Rejected valid C++ code since r257961)

re PR c++/84582 (Rejected valid C++ code since r257961)

	PR c++/84582
	* semantics.c (force_paren_expr): Create a PAREN_EXPR when in
	a template.
	(maybe_undo_parenthesized_ref): Unwrap PAREN_EXPR.
	* typeck2.c (store_init_value): Call fold_non_dependent_expr instead
	of instantiate_non_dependent_expr.
	* tree.c (lvalue_kind): Handle PAREN_EXPR like NON_DEPENDENT_EXPR.

	* g++.dg/cpp1y/auto-fn15.C: Extend testing.
	* g++.dg/cpp1z/static1.C: New test.
	* g++.dg/template/static37.C: New test.

Co-Authored-By: Jason Merrill <jason@redhat.com>
From-SVN: r258116