This patch supports following MVE ACLE intrinsics to get and set vector lane.

vsetq_lane_f16, vsetq_lane_f32, vsetq_lane_s16, vsetq_lane_s32, vsetq_lane_s8, vsetq_lane_s64, vsetq_lane_u8, vsetq_lane_u16, vsetq_lane_u32, vsetq_lane_u64, vgetq_lane_f16, vgetq_lane_f32, vgetq_lane_s16, vgetq_lane_s32, vgetq_lane_s8, vgetq_lane_s64, vgetq_lane_u8, vgetq_lane_u16, vgetq_lane_u32, vgetq_lane_u64.

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

2020-03-23  Srinath Parvathaneni  <srinath.parvathaneni@arm.com>
            Andre Vieira  <andre.simoesdiasvieira@arm.com>
            Mihail Ionescu  <mihail.ionescu@arm.com>

	* config/arm/arm_mve.h (vsetq_lane_f16): Define macro.
	(vsetq_lane_f32): Likewise.
	(vsetq_lane_s16): Likewise.
	(vsetq_lane_s32): Likewise.
	(vsetq_lane_s8): Likewise.
	(vsetq_lane_s64): Likewise.
	(vsetq_lane_u8): Likewise.
	(vsetq_lane_u16): Likewise.
	(vsetq_lane_u32): Likewise.
	(vsetq_lane_u64): Likewise.
	(vgetq_lane_f16): Likewise.
	(vgetq_lane_f32): Likewise.
	(vgetq_lane_s16): Likewise.
	(vgetq_lane_s32): Likewise.
	(vgetq_lane_s8): Likewise.
	(vgetq_lane_s64): Likewise.
	(vgetq_lane_u8): Likewise.
	(vgetq_lane_u16): Likewise.
	(vgetq_lane_u32): Likewise.
	(vgetq_lane_u64): Likewise.
	(__ARM_NUM_LANES): Likewise.
	(__ARM_LANEQ): Likewise.
	(__ARM_CHECK_LANEQ): Likewise.
	(__arm_vsetq_lane_s16): Define intrinsic.
	(__arm_vsetq_lane_s32): Likewise.
	(__arm_vsetq_lane_s8): Likewise.
	(__arm_vsetq_lane_s64): Likewise.
	(__arm_vsetq_lane_u8): Likewise.
	(__arm_vsetq_lane_u16): Likewise.
	(__arm_vsetq_lane_u32): Likewise.
	(__arm_vsetq_lane_u64): Likewise.
	(__arm_vgetq_lane_s16): Likewise.
	(__arm_vgetq_lane_s32): Likewise.
	(__arm_vgetq_lane_s8): Likewise.
	(__arm_vgetq_lane_s64): Likewise.
	(__arm_vgetq_lane_u8): Likewise.
	(__arm_vgetq_lane_u16): Likewise.
	(__arm_vgetq_lane_u32): Likewise.
	(__arm_vgetq_lane_u64): Likewise.
	(__arm_vsetq_lane_f16): Likewise.
	(__arm_vsetq_lane_f32): Likewise.
	(__arm_vgetq_lane_f16): Likewise.
	(__arm_vgetq_lane_f32): Likewise.
	(vgetq_lane): Define polymorphic variant.
	(vsetq_lane): Likewise.
	* config/arm/mve.md (mve_vec_extract<mode><V_elem_l>): Define RTL
	pattern.
	(mve_vec_extractv2didi): Likewise.
	(mve_vec_extract_sext_internal<mode>): Likewise.
	(mve_vec_extract_zext_internal<mode>): Likewise.
	(mve_vec_set<mode>_internal): Likewise.
	(mve_vec_setv2di_internal): Likewise.
	* config/arm/neon.md (vec_set<mode>): Move RTL pattern to vec-common.md
	file.
	(vec_extract<mode><V_elem_l>): Rename to
	"neon_vec_extract<mode><V_elem_l>".
	(vec_extractv2didi): Rename to "neon_vec_extractv2didi".
	* config/arm/vec-common.md (vec_extract<mode><V_elem_l>): Define RTL
	pattern common for MVE and NEON.
	(vec_set<mode>): Move RTL pattern from neon.md and modify to accept both
	MVE and NEON.

gcc/testsuite/ChangeLog:

2020-03-23  Srinath Parvathaneni  <srinath.parvathaneni@arm.com>
            Andre Vieira  <andre.simoesdiasvieira@arm.com>
            Mihail Ionescu  <mihail.ionescu@arm.com>

	* gcc.target/arm/mve/intrinsics/vgetq_lane_f16.c: New test.
	* gcc.target/arm/mve/intrinsics/vgetq_lane_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vgetq_lane_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vgetq_lane_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vgetq_lane_s64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vgetq_lane_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vgetq_lane_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vgetq_lane_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vgetq_lane_u64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vgetq_lane_u8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_f16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_s64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_u64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_u8.c: Likewise.