* doc/extend.tex (Declaring Attributes of Functions): Extended
	description of short_call and long_call attributes for ARC and
	added index entries.
	* doc/extend.texi (ARC Built-in Functions): Use deftypefn for
	built-ins.
	* doc/invoke.texi (Option Summary): Remove -margonaut,
	-mbig-endian, -mEB, -mlittle-endian, -mEL. Change -mEA to -mea and
	-multcost to -mmultcost.
	(ARC Options): Mark -margonaut, -mbig-endian, -mEB,
	-mlittle-endian, -mEL, -mEA and -multcost as
	deprecated. Consistent description of ARC v2 EM architecture
	throughout. Use -mcpu=ARCv2EM to specify ARC v2 EM architecture
	with -mARCv2EM and -mEM as aliases. Provided -mea as replacement
	for -mEA and -mmultcost as replacements for -multcost. -mmul32x16
	not for ARC v2 EM, -mmul64 for ARC600 only. -msimd for ARC700
	only. -mlra marked as experimental. -mtune match CPU names of
	-mcpu and mark lower case alternatives as deprecated. Remove
	-mdev_rem and -mcode_density from deprecated.
	* doc/invoke.texi (Option Summary): Add @gol for ARC option
	lines.