re PR c++/11105 ([3.3/3.4 regression of sorts] ICE in mangle_conv_op_name_for_type)

	PR c++/11105
	* cp-tree.h (DECL_CONV_FN_TYPE): New method.
	* mangle.c (struct globals): Remove internal_mangling_p.
	(write_unqualified_name): Use DECL_CONV_FN_TYPE.
	(write_template_parm): Don't write out the level number.
	(conv_type_names): New variable.
	(hash_type): New function.
	(compare_type): Likewise.
	(mangle_conv_op_name_for_type): Don't try to mangle conversion
	operator names.
	* search.c (lookup_conversion_operator): New function.
	(lookup_fnfields_1): Use it.

	PR c++/11105
	* g++.dg/abi/conv1.C: Remove it.
	* g++.dg/template/conv7.C: New test.
	* g++.dg/template/conv8.C: Likewise.
	* g++.old-deja/g++.ext/pretty2.C: Do not test __FUNCTION__ for a
	conversion operator.

From-SVN: r68095