[ARM][GCC][3/5x]: MVE store intrinsics with predicated suffix.

[ARM][GCC][3/5x]: MVE store intrinsics with predicated suffix.

This patch supports the following MVE ACLE store intrinsics with predicated suffix.

vstrbq_p_s8, vstrbq_p_s32, vstrbq_p_s16, vstrbq_p_u8, vstrbq_p_u32, vstrbq_p_u16, vstrbq_scatter_offset_p_s8, vstrbq_scatter_offset_p_s32, vstrbq_scatter_offset_p_s16, vstrbq_scatter_offset_p_u8, vstrbq_scatter_offset_p_u32, vstrbq_scatter_offset_p_u16, vstrwq_scatter_base_p_s32, vstrwq_scatter_base_p_u32.

Please refer to M-profile Vector Extension (MVE) intrinsics [1]  for more details.
[1]  https://developer.arm.com/architectures/instruction-sets/simd-isas/helium/mve-intrinsics

2020-03-18  Andre Vieira  <andre.simoesdiasvieira@arm.com>
            Mihail Ionescu  <mihail.ionescu@arm.com>
            Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

	* config/arm/arm-builtins.c (STRS_P_QUALIFIERS): Define builtin
	qualifier.
	(STRU_P_QUALIFIERS): Likewise.
	(STRSU_P_QUALIFIERS): Likewise.
	(STRSS_P_QUALIFIERS): Likewise.
	(STRSBS_P_QUALIFIERS): Likewise.
	(STRSBU_P_QUALIFIERS): Likewise.
	* config/arm/arm_mve.h (vstrbq_p_s8): Define macro.
	(vstrbq_p_s32): Likewise.
	(vstrbq_p_s16): Likewise.
	(vstrbq_p_u8): Likewise.
	(vstrbq_p_u32): Likewise.
	(vstrbq_p_u16): Likewise.
	(vstrbq_scatter_offset_p_s8): Likewise.
	(vstrbq_scatter_offset_p_s32): Likewise.
	(vstrbq_scatter_offset_p_s16): Likewise.
	(vstrbq_scatter_offset_p_u8): Likewise.
	(vstrbq_scatter_offset_p_u32): Likewise.
	(vstrbq_scatter_offset_p_u16): Likewise.
	(vstrwq_scatter_base_p_s32): Likewise.
	(vstrwq_scatter_base_p_u32): Likewise.
	(__arm_vstrbq_p_s8): Define intrinsic.
	(__arm_vstrbq_p_s32): Likewise.
	(__arm_vstrbq_p_s16): Likewise.
	(__arm_vstrbq_p_u8): Likewise.
	(__arm_vstrbq_p_u32): Likewise.
	(__arm_vstrbq_p_u16): Likewise.
	(__arm_vstrbq_scatter_offset_p_s8): Likewise.
	(__arm_vstrbq_scatter_offset_p_s32): Likewise.
	(__arm_vstrbq_scatter_offset_p_s16): Likewise.
	(__arm_vstrbq_scatter_offset_p_u8): Likewise.
	(__arm_vstrbq_scatter_offset_p_u32): Likewise.
	(__arm_vstrbq_scatter_offset_p_u16): Likewise.
	(__arm_vstrwq_scatter_base_p_s32): Likewise.
	(__arm_vstrwq_scatter_base_p_u32): Likewise.
	(vstrbq_p): Define polymorphic variant.
	(vstrbq_scatter_offset_p): Likewise.
	(vstrwq_scatter_base_p): Likewise.
	* config/arm/arm_mve_builtins.def (STRS_P_QUALIFIERS): Use builtin
	qualifier.
	(STRU_P_QUALIFIERS): Likewise.
	(STRSU_P_QUALIFIERS): Likewise.
	(STRSS_P_QUALIFIERS): Likewise.
	(STRSBS_P_QUALIFIERS): Likewise.
	(STRSBU_P_QUALIFIERS): Likewise.
	* config/arm/mve.md (mve_vstrbq_scatter_offset_p_<supf><mode>): Define
	RTL pattern.
	(mve_vstrwq_scatter_base_p_<supf>v4si): Likewise.
	(mve_vstrbq_p_<supf><mode>): Likewise.

gcc/testsuite/ChangeLog:

2020-03-18  Andre Vieira  <andre.simoesdiasvieira@arm.com>
            Mihail Ionescu  <mihail.ionescu@arm.com>
            Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

	* gcc.target/arm/mve/intrinsics/vstrbq_p_s16.c: New test.
	* gcc.target/arm/mve/intrinsics/vstrbq_p_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrbq_p_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrbq_p_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrbq_p_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrbq_p_u8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrbq_scatter_offset_p_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrbq_scatter_offset_p_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrbq_scatter_offset_p_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrbq_scatter_offset_p_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrbq_scatter_offset_p_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrbq_scatter_offset_p_u8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrwq_scatter_base_p_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrwq_scatter_base_p_u32.c: Likewise.