Following MVE ACLE intrinsics have an issue with writeback to the base address.

vldrdq_gather_base_wb_s64, vldrdq_gather_base_wb_u64, vldrdq_gather_base_wb_z_s64, vldrdq_gather_base_wb_z_u64, vldrwq_gather_base_wb_s32, vldrwq_gather_base_wb_u32, vldrwq_gather_base_wb_z_s32, vldrwq_gather_base_wb_z_u32, vldrwq_gather_base_wb_f32, vldrwq_gather_base_wb_z_f32.

This patch fixes the bug reported in PR94317 by adding separate builtin calls to update the result and writeback to base address for the above intrinsics.

2020-04-02  Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

	PR target/94317
	* config/arm/arm-builtins.c (LDRGBWBXU_QUALIFIERS): Define.
	(LDRGBWBXU_Z_QUALIFIERS): Likewise.
	* config/arm/arm_mve.h (__arm_vldrdq_gather_base_wb_s64): Modify
	intrinsic defintion by adding a new builtin call to writeback into base
	address.
	(__arm_vldrdq_gather_base_wb_u64): Likewise.
	(__arm_vldrdq_gather_base_wb_z_s64): Likewise.
	(__arm_vldrdq_gather_base_wb_z_u64): Likewise.
	(__arm_vldrwq_gather_base_wb_s32): Likewise.
	(__arm_vldrwq_gather_base_wb_u32): Likewise.
	(__arm_vldrwq_gather_base_wb_z_s32): Likewise.
	(__arm_vldrwq_gather_base_wb_z_u32): Likewise.
	(__arm_vldrwq_gather_base_wb_f32): Likewise.
	(__arm_vldrwq_gather_base_wb_z_f32): Likewise.
	* config/arm/arm_mve_builtins.def (vldrwq_gather_base_wb_z_u): Modify
	builtin's qualifier.
	(vldrdq_gather_base_wb_z_u): Likewise.
	(vldrwq_gather_base_wb_u): Likewise.
	(vldrdq_gather_base_wb_u): Likewise.
	(vldrwq_gather_base_wb_z_s): Likewise.
	(vldrwq_gather_base_wb_z_f): Likewise.
	(vldrdq_gather_base_wb_z_s): Likewise.
	(vldrwq_gather_base_wb_s): Likewise.
	(vldrwq_gather_base_wb_f): Likewise.
	(vldrdq_gather_base_wb_s): Likewise.
	(vldrwq_gather_base_nowb_z_u): Define builtin.
	(vldrdq_gather_base_nowb_z_u): Likewise.
	(vldrwq_gather_base_nowb_u): Likewise.
	(vldrdq_gather_base_nowb_u): Likewise.
	(vldrwq_gather_base_nowb_z_s): Likewise.
	(vldrwq_gather_base_nowb_z_f): Likewise.
	(vldrdq_gather_base_nowb_z_s): Likewise.
	(vldrwq_gather_base_nowb_s): Likewise.
	(vldrwq_gather_base_nowb_f): Likewise.
	(vldrdq_gather_base_nowb_s): Likewise.
	* config/arm/mve.md (mve_vldrwq_gather_base_nowb_<supf>v4si): Define RTL
	pattern.
	(mve_vldrwq_gather_base_wb_<supf>v4si): Modify RTL pattern.
	(mve_vldrwq_gather_base_nowb_z_<supf>v4si): Define RTL pattern.
	(mve_vldrwq_gather_base_wb_z_<supf>v4si): Modify RTL pattern.
	(mve_vldrwq_gather_base_wb_fv4sf): Modify RTL pattern.
	(mve_vldrwq_gather_base_nowb_fv4sf): Define RTL pattern.
	(mve_vldrwq_gather_base_wb_z_fv4sf): Modify RTL pattern.
	(mve_vldrwq_gather_base_nowb_z_fv4sf): Define RTL pattern.
	(mve_vldrdq_gather_base_nowb_<supf>v4di): Define RTL pattern.
	(mve_vldrdq_gather_base_wb_<supf>v4di):  Modify RTL pattern.
	(mve_vldrdq_gather_base_nowb_z_<supf>v4di): Define RTL pattern.
	(mve_vldrdq_gather_base_wb_z_<supf>v4di):  Modify RTL pattern.

gcc/testsuite/ChangeLog:

2020-04-02  Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

	PR target/94317
	* gcc.target/arm/mve/intrinsics/vldrdq_gather_base_wb_s64.c: Modify.
	* gcc.target/arm/mve/intrinsics/vldrdq_gather_base_wb_u64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vldrdq_gather_base_wb_z_s64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vldrdq_gather_base_wb_z_u64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vldrwq_gather_base_wb_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vldrwq_gather_base_wb_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vldrwq_gather_base_wb_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vldrwq_gather_base_wb_z_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vldrwq_gather_base_wb_z_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vldrwq_gather_base_wb_z_u32.c: Likewise.