[AArch64][dejagnu] Dejagnu support for ARMv8.1 Adv.SIMD.

[AArch64][dejagnu] Dejagnu support for ARMv8.1 Adv.SIMD.

        gcc/testsuite
	* lib/target-supports.exp (add_options_for_arm_v8_1a_neon): New.
	(check_effective_target_arm_arch_FUNC_ok)
	(add_options_for_arm_arch_FUNC)
	(check_effective_target_arm_arch_FUNC_multilib): Add "armv8.1-a"
	to the list to be generated.
	(check_effective_target_arm_v8_1a_neon_ok_nocache): New.
	(check_effective_target_arm_v8_1a_neon_ok): New.
	(check_effective_target_arm_v8_1a_neon_hw): New.

From-SVN: r230970