re PR c++/69315 (ICE in finish_function with constexpr and templates)

re PR c++/69315 (ICE in finish_function with constexpr and templates)

	PR c++/69315
	* cp-tree.h (defer_mark_used_calls, deferred_mark_used_calls): Remove.
	* decl.c (defer_mark_used_calls, deferred_mark_used_calls): Remove.
	(finish_function): Don't set or test them.
	* decl2.c (mark_used): Don't handle defer_mark_used_calls.

	* g++.dg/cpp0x/constexpr-69315.C: New test.
	* g++.dg/cpp0x/variadic122.C: Change one dg-warning into dg-bogus.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>
Co-Authored-By: Jason Merrill <jason@redhat.com>
From-SVN: r234436