RISC-V: Add testcases for VSETVL PASS

RISC-V: Add testcases for VSETVL PASS

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/rvv.exp: Adjust to enable tests for VSETVL PASS.
	* gcc.target/riscv/rvv/vsetvl/dump-1.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-1.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-10.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-11.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-12.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-13.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-14.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-15.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-16.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-17.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-18.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-19.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-2.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-3.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-4.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-5.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-6.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-7.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-8.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_block-9.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_vtype-1.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_vtype-2.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_vtype-3.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_vtype-4.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_vtype-5.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_vtype-6.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_vtype-7.c: New test.
	* gcc.target/riscv/rvv/vsetvl/vlmax_single_vtype-8.c: New test.