* expmed.c (extract_bit_field): Do not use insv/extv/extzv patterns
	if the bitsize is zero.
	* doc/md.texi (Standard Pattern Names): Document it.

	* config/ia64/ia64.c (ia64_pass_by_reference): Delete.
	(TARGET_PASS_BY_REFERENCE): Likewise.

From-SVN: r106605