PR c++/37177
	* pt.c (resolve_nondeduced_context): New.
	* cvt.c (convert_to_void): Call it.
	* semantics.c (finish_decltype_type): Likewise.
	* typeck.c (decay_conversion): Here too.
	* pt.c (tsubst_decl): Don't clobber input_location.
	Don't register a bad specialization.

From-SVN: r152564