Fix the RTL of some sparc VIS patterns.

Fix the RTL of some sparc VIS patterns.

	* config/sparc/sparc.md (UNSPEC_FPMERGE): Delete.
	(UNSPEC_MUL16AU, UNSPEC_MUL8, UNSPEC_MUL8SU, UNSPEC_MULDSU): New
	unspecs.
	(fpmerge_vis): Remove inaccurate comment, represent using vec_select
	of a vec_concat.
	(vec_interleave_lowv8qi, vec_interleave_highv8qi): New insns.
	(fmul8x16_vis, fmul8x16au_vis, fmul8sux16_vis, fmuld8sux16_vis):
	Reimplement as unspecs and remove inaccurate comments.
	(vis3_shift_patname): New code attr.
	(<vis3_shift_insn><vbits>_vis): Rename to "v<vis3_shift_patname><mode>3".
	(vis3_addsub_ss_patname): New code attr.
	(<vis3_addsub_ss_insn><vbits>_vis): Rename to
	"<vis3_addsub_ss_patname><mode>3".
	* config/sparc/sparc.c (sparc_vis_init_builtins): Update to
	accommodate pattern name changes.

From-SVN: r179943