* read-rtl.c (struct macro_traverse_data): Add unknown_mode_attr

	* read-rtl.c (struct macro_traverse_data): Add unknown_mode_attr
	field.
	(mode_attr_index): Remove check for defined attribute.  Remove
	infile parameter.  Change all callers.
	(apply_mode_maps): Add unknown parameter.  Change caller.  Always
	return after finding attribute.
	(apply_macro_to_rtx): Add unknown_mode_attr parameter.  Change
	callers.
	(apply_macro_traverse): Set mtd->unknown_mode_attr.
	(read_rtx): Use mtd.unknown_mode_attr to check for an undefined
	attribute used for a mode.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@99829 138bc75d-0d04-0410-961f-82ee72b054a4