re PR c++/68926 (decltype and sfinae to check for template instance availability...

re PR c++/68926 (decltype and sfinae to check for template instance availability fails to compile)

	PR c++/68926

	* pt.c (resolve_nondeduced_context): Add complain parm.
	(do_auto_deduction): Pass it.
	* cvt.c (convert_to_void): Likewise.
	* decl.c (cp_finish_decl): Likewise.
	* init.c (build_new): Likewise.
	* rtti.c (get_tinfo_decl_dynamic): Likewise.
	* semantics.c (finish_decltype_type): Likewise.
	* typeck.c (decay_conversion): Likewise.
	* cp-tree.h: Adjust declaration.
	* call.c (standard_conversion): Add complain parm, pass it along.
	(implicit_conversion): Pass it.

From-SVN: r233304