aarch64: Fold vget_high_* intrinsics to BIT_FIELD_REF [PR102171]

aarch64: Fold vget_high_* intrinsics to BIT_FIELD_REF [PR102171]

This patch is a follow-up of r15-697-ga2e4fe5a53cf75 to also fold vget_high_*
intrinsics to BIT_FILED_REF and remove the vget_high_* definitions from
arm_neon.h to use the new intrinsics framework.

	PR target/102171

gcc/ChangeLog:

	* config/aarch64/aarch64-builtins.cc (AARCH64_SIMD_VGET_HIGH_BUILTINS):
	New macro to create definitions for all vget_high intrinsics.
	(VGET_HIGH_BUILTIN): Likewise.
	(enum aarch64_builtins): Add vget_high function codes.
	(AARCH64_SIMD_VGET_LOW_BUILTINS): Delete duplicate macro.
	(aarch64_general_fold_builtin): Fold vget_high calls.
	* config/aarch64/aarch64-simd-builtins.def: Delete vget_high builtins.
	* config/aarch64/aarch64-simd.md (aarch64_get_high<mode>): Delete.
	(aarch64_vget_hi_halfv8bf): Likewise.
	* config/aarch64/arm_neon.h (__attribute__): Delete.
	(vget_high_f16): Likewise.
	(vget_high_f32): Likewise.
	(vget_high_f64): Likewise.
	(vget_high_p8): Likewise.
	(vget_high_p16): Likewise.
	(vget_high_p64): Likewise.
	(vget_high_s8): Likewise.
	(vget_high_s16): Likewise.
	(vget_high_s32): Likewise.
	(vget_high_s64): Likewise.
	(vget_high_u8): Likewise.
	(vget_high_u16): Likewise.
	(vget_high_u32): Likewise.
	(vget_high_u64): Likewise.
	(vget_high_bf16): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/vget_high_2.c: New test.
	* gcc.target/aarch64/vget_high_2_be.c: New test.

Signed-off-by: Pengxuan Zheng <quic_pzheng@quicinc.com>