* read.c (potable): Add balignw, balignl, p2alignw, and p2alignl.

	* read.c (potable): Add balignw, balignl, p2alignw, and p2alignl.
	(do_align): Take new len parameter.  Change all callers.  Pass it
	to md_do_align.
	(s_align_bytes): Arg now indicates the length of the fill pattern.
	(s_align_ptwo): Likewise.
	* config/obj-coff.c (write_object_file): Pass length to
	md_do_align.
	* config/tc-i386.h (md_do_align): Take new len parameter.
	* config/tc-m88k.h (md_do_align): Likewise.
	* config/tc-m88k.c (m88k_do_align): Likewise.
	* config/tc-sh.h (md_do_align): Likewise.
	* config/tc-sh.c (sh_do_align): Likewise.
	* doc/as.texinfo: Document new pseudo-ops.

	* config/obj-coff.c (fixup_mdeps): Divide offset by fr_var, as is
	done in cvt_frag_to_fill.
PR 8974.