RISC-V: Add test for vec_duplicate + vaaddu.vv combine case 0 with GR2VR cost 0,...

RISC-V: Add test for vec_duplicate + vaaddu.vv combine case 0 with GR2VR cost 0, 2 and 15 for QI, HI and SI mode

Add asm dump check and run test for vec_duplicate + vaaddu.vv
combine to vaaddu.vx, with the GR2VR cost is 0, 2 and 15.  Please
note DImode is not included here.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/vx_vf/vx-1-u16.c: Add asm check.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-1-u32.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-1-u8.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-2-u16.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-2-u32.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-2-u8.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-3-u16.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-3-u32.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-3-u8.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_binary.h: Add test
	helper macros.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_binary_data.h: Add test
	data for run test.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_vaadd-run-1-u16.c: New test.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_vaadd-run-1-u32.c: New test.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_vaadd-run-1-u8.c: New test.

Signed-off-by: Pan Li <pan2.li@intel.com>