re PR c++/4361 (bogus ambiguity taking the address of a member template)

re PR c++/4361 (bogus ambiguity taking the address of a member template)

cp:
	PR c++/4361
	* cp-tree.h (CLASSTYPE_METHOD_VEC): Document where templated
	conversion operators go.
	(struct lang_decl_flags): Add template_conv_p and unused
	bitfields.
	(DECL_TEMPLATE_CONV_FN_P): New macro.
	* call.c (build_user_type_conversion_1): Don't check second type
	conversion of overload set first.
	* class.c (add_method): Make sure templated conversion operators
	all end up on slot 2.
	* lex.c (do_identifier): A conversion operator token might be
	satisfied by a templated conversion operator.
	* mangle.c (struct globals) Add internal_mangling_p member.
	(write_template_param): Do internal mangling, if needed.
	(mangle_conv_op_name_for_type): Request internal mangling.
	* pt.c (check_explicit_specialization): Use
	CLASSTYPE_FIRST_CONVERSION_SLOT.
	(template_parm_this_level_p): New function.
	(push_template_decl_real): Determine DECL_TEMPLATE_CONV_FN_P.
	* search.c (lookup_fn_fields_1): Template conversions will be on
	the first slot.
	* typeck.c (build_component_ref): Preserve the type of an
	conversion operator name on the overload type.
	(build_x_function_call): Retrieve the conversion operator name.
testsuite:
	* g++.dg/template/conv1.C: New test.
	* g++.dg/template/conv2.C: New test.
	* g++.dg/template/conv3.C: New test.
	* g++.dg/template/conv4.C: New test.

From-SVN: r50889