[ARM/AArch64 Testsuite] Add float16 tests to advsimd-intrinsics testsuite

[ARM/AArch64 Testsuite] Add float16 tests to advsimd-intrinsics testsuite

	* gcc.target/aarch64/advsimd-intrinsics/advsimd-intrinsics.exp:
	Set additional_flags for neon-fp16 if supported, else fallback to neon.

	* gcc.target/aarch64/advsimd-intrinsics/arm-neon-ref.h
	(hfloat16_t): New.
	(result, expected, clean_results, DECL_VARIABLE_64BITS_VARIANTS,
	DECL_VARIABLE_128BITS_VARIANTS): Add float16x4_t and float16x8_t cases
	if supported.
	(CHECK_RESULTS): Redefine using CHECK_RESULTS_NAMED.
	(CHECK_RESULTS_NAMED): Move body to CHECK_RESULTS_NAMED_NO_FP16;
	redefine in terms of CHECK_RESULTS_NAMED_NO_FP16 with float16 variants
	when those are supported.
	(CHECK_RESULTS_NAMED_NO_FP16, CHECK_RESULTS_NO_FP16): New.
	(vdup_n_f16): New.

	* gcc.target/aarch64/advsimd-intrinsics/compute-ref-data.h (buffer,
	buffer_pad, buffer_dup, buffer_dup_pad): Add float16x4 and float16x8_t
	cases if supported.

	* gcc.target/aarch64/advsimd-intrinsics/vbsl.c (exec_vbsl):
	Use CHECK_RESULTS_NO_FP16 in place of CHECK_RESULTS.
	* gcc.target/aarch64/advsimd-intrinsics/vdup-vmov.c (exec_vdup_vmov):
	Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vdup_lane.c (exec_vdup_lane):
	Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vext.c (exec_vext): Likewise.

	* gcc.target/aarch64/advsimd-intrinsics/vcombine.c (expected):
	Add float16x8_t case.
	(main, exec_vcombine): test float16x4_t -> float16x8_t, if supported.
	* gcc.target/aarch64/advsimd-intrinsics/vcreate.c (expected,
	main, exec_vcreate): Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vget_high (expected,
	 exec_vget_high): Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vget_low.c (expected,
	exec_vget_low): Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vld1.c (expected, exec_vld1):
	Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vld1_dup.c (expected,
	exec_vld1_dup): Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vld1_lane.c (expected,
	exec_vld1_lane): Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vldX.c (expected, exec_vldX):
	Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vldX_dup.c (expected,
	exec_vldX_dup): Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vldX_lane.c (expected,
	exec_vldX_lane): Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vset_lane.c (expected,
	exec_vset_lane): Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/vst1_lane.c (expected,
	 exec_vst1_lane): Likewise.

From-SVN: r227554