[AArch64_be] Fix vtbl[34] and vtbx4

[AArch64_be] Fix vtbl[34] and vtbx4

2015-10-12  Christophe Lyon  <christophe.lyon@linaro.org>

	* config/aarch64/aarch64-simd-builtins.def: Update builtins
	tables: add tbl3 and tbx4.
	* config/aarch64/aarch64-simd.md (aarch64_tbl3v8qi): New.
	(aarch64_tbx4v8qi): New.
	* config/aarch64/arm_neon.h (vtbl3_s8, vtbl3_u8, vtbl3_p8)
	(vtbl4_s8, vtbl4_u8, vtbl4_p8, vtbx4_s8, vtbx4_u8, vtbx4_p8):
	Rewrite using builtin functions.
	* config/aarch64/iterators.md (UNSPEC_TBX): New.

From-SVN: r228716