[ARM][GCC][4/x]: MVE ACLE vector interleaving store intrinsics.

[ARM][GCC][4/x]: MVE ACLE vector interleaving store intrinsics.

This patch supports MVE ACLE intrinsics vst4q_s8, vst4q_s16, vst4q_s32, vst4q_u8, vst4q_u16, vst4q_u32, vst4q_f16 and vst4q_f32.

In this patch arm_mve_builtins.def file is added to the source code in which the builtins for MVE ACLE intrinsics are defined using builtin qualifiers.

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

2020-03-16  Andre Vieira  <andre.simoesdiasvieira@arm.com>
	    Mihail Ionescu  <mihail.ionescu@arm.com>
	    Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

	* config/arm/arm-builtins.c (CF): Define mve_builtin_data.
	(VAR1): Define.
	(ARM_BUILTIN_MVE_PATTERN_START): Define.
	(arm_init_mve_builtins): Define function.
	(arm_init_builtins): Add TARGET_HAVE_MVE check.
	(arm_expand_builtin_1): Check the range of fcode.
	(arm_expand_mve_builtin): Define function to expand MVE builtins.
	(arm_expand_builtin): Check the range of fcode.
	* config/arm/arm_mve.h (__ARM_FEATURE_MVE): Define MVE floating point
	types.
	(__ARM_MVE_PRESERVE_USER_NAMESPACE): Define to protect user namespace.
	(vst4q_s8): Define macro.
	(vst4q_s16): Likewise.
	(vst4q_s32): Likewise.
	(vst4q_u8): Likewise.
	(vst4q_u16): Likewise.
	(vst4q_u32): Likewise.
	(vst4q_f16): Likewise.
	(vst4q_f32): Likewise.
	(__arm_vst4q_s8): Define inline builtin.
	(__arm_vst4q_s16): Likewise.
	(__arm_vst4q_s32): Likewise.
	(__arm_vst4q_u8): Likewise.
	(__arm_vst4q_u16): Likewise.
	(__arm_vst4q_u32): Likewise.
	(__arm_vst4q_f16): Likewise.
	(__arm_vst4q_f32): Likewise.
	(__ARM_mve_typeid): Define macro with MVE types.
	(__ARM_mve_coerce): Define macro with _Generic feature.
	(vst4q): Define polymorphic variant for different vst4q builtins.
	* config/arm/arm_mve_builtins.def: New file.
	* config/arm/iterators.md (VSTRUCT): Modify to allow XI and OI
	modes in MVE.
	* config/arm/mve.md (MVE_VLD_ST): Define iterator.
	(unspec): Define unspec.
	(mve_vst4q<mode>): Define RTL pattern.
	* config/arm/neon.md (mov<mode>): Modify expand to allow XI and OI
	modes in MVE.
	(neon_mov<mode>): Modify RTL define_insn to allow XI and OI modes
	in MVE.
	(define_split): Allow OI mode split for MVE after reload.
	(define_split): Allow XI mode split for MVE after reload.
	* config/arm/t-arm (arm.o): Add entry for arm_mve_builtins.def.
	(arm-builtins.o): Likewise.

2020-03-16  Andre Vieira  <andre.simoesdiasvieira@arm.com>
	    Mihail Ionescu  <mihail.ionescu@arm.com>
	    Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

	* gcc.target/arm/mve/intrinsics/vst4q_f16.c: New test.
	* gcc.target/arm/mve/intrinsics/vst4q_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vst4q_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vst4q_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vst4q_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vst4q_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vst4q_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vst4q_u8.c: Likewise.