re PR c++/66743 (ICE: tree check: expected record_type or union_type or qual_union_type, have underlying_type in for_each_template_parm_r, at cp/pt.c:8234)

	PR c++/66743
	* pt.c (for_each_template_parm_r) [UNDERLYING_TYPE]: Use
	TYPE_VALUES_RAW rather than TYPE_FIELDS.

From-SVN: r225365