system.h (IFCVT_EXTRA_FIELDS): Poison.

	* system.h (IFCVT_EXTRA_FIELDS): Poison.
	(IFCVT_INIT_EXTRA_FIELDS): Poison.
	* basic-block.h (struct ce_if_block): Remove IFCVT_EXTRA_FIELDS.
	* ifcvt.c (find_if_header): Use IFCVT_MACHDEP_INIT instead of
	IFCVT_INIT_EXTRA_FIELDS.
	* gengtype-parse.c (struct_field_seq): Remove obsolete comment.
	* config/frv/frv.h (IFCVT_INIT_EXTRA_FIELDS): Rename to
	IFCVT_MACHDEP_INIT.
	* config/frv/frv.c (frv_ifcvt_init_extra_fields): Rename to
	frv_ifcvt_machdep_init.
	* doc/tm.texi.in (IFCVT_INIT_EXTRA_FIELDS, IFCVT_EXTRA_FIELDS):
	Remove documentation.
	(IFCVT_MACHDEP_INIT): Document.
	* doc/tm.texi: Regenerate.

From-SVN: r189074