gcc/
	* config.gcc (aarch64*-*-*): Install arm_fp16.h.
	* config/aarch64/aarch64-builtins.c (hi_UP): New.
	* config/aarch64/aarch64-simd-builtins.def: Register new builtins.
	* config/aarch64/aarch64-simd.md (aarch64_frsqrte<mode>): Extend to HF
	mode.
	(aarch64_frecp<FRECP:frecp_suffix><mode>): Likewise.
	(aarch64_cm<optab><mode>): Likewise.
	* config/aarch64/aarch64.md (<frint_pattern><mode>2): Likewise.
	(l<fcvt_pattern><su_optab><GPF:mode><GPI:mode>2): Likewise.
	(fix_trunc<GPF:mode><GPI:mode>2): Likewise.
	(sqrt<mode>2): Likewise.
	(abs<mode>2): Likewise.
	(<optab><mode>hf2): New pattern for HF mode.
	(<optab>hihf2): Likewise.
	* config/aarch64/arm_neon.h: Include arm_fp16.h.
	* config/aarch64/iterators.md (GPF_F16, GPI_F16, VHSDF_HSDF): New.
	(w1, w2, v, s, q, Vmtype, V_cmp_result, fcvt_iesize, FCVT_IESIZE):
	Support HF mode.
	* config/aarch64/arm_fp16.h: New file.
	(vabsh_f16, vceqzh_f16, vcgezh_f16, vcgtzh_f16, vclezh_f16, vcltzh_f16,
	vcvth_f16_s16, vcvth_f16_s32, vcvth_f16_s64, vcvth_f16_u16,
	vcvth_f16_u32, vcvth_f16_u64, vcvth_s16_f16, vcvth_s32_f16,
	vcvth_s64_f16, vcvth_u16_f16, vcvth_u32_f16, vcvth_u64_f16,
	vcvtah_s16_f16, vcvtah_s32_f16, vcvtah_s64_f16, vcvtah_u16_f16,
	vcvtah_u32_f16, vcvtah_u64_f16, vcvtmh_s16_f16, vcvtmh_s32_f16,
	vcvtmh_s64_f16, vcvtmh_u16_f16, vcvtmh_u32_f16, vcvtmh_u64_f16,
	vcvtnh_s16_f16, vcvtnh_s32_f16, vcvtnh_s64_f16, vcvtnh_u16_f16,
	vcvtnh_u32_f16, vcvtnh_u64_f16, vcvtph_s16_f16, vcvtph_s32_f16,
	vcvtph_s64_f16, vcvtph_u16_f16, vcvtph_u32_f16, vcvtph_u64_f16,
	vnegh_f16, vrecpeh_f16, vrecpxh_f16, vrndh_f16, vrndah_f16, vrndih_f16,
	vrndmh_f16, vrndnh_f16, vrndph_f16, vrndxh_f16, vrsqrteh_f16,
	vsqrth_f16): New.

From-SVN: r238722