RISC-V: Expand VLS mode to scalar mode move[PR111391]

RISC-V: Expand VLS mode to scalar mode move[PR111391]

This patch fixes https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111391

	PR target/111391

gcc/ChangeLog:

	* config/riscv/autovec.md (@vec_extract<mode><vel>): Remove @.
	(vec_extract<mode><vel>): Ditto.
	* config/riscv/riscv-vsetvl.cc (emit_vsetvl_insn): Fix bug.
	(pass_vsetvl::local_eliminate_vsetvl_insn): Fix bug.
	* config/riscv/riscv.cc (riscv_legitimize_move): Expand VLS mode to scalar mode move.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/partial/slp-9.c: Adapt test.
	* gcc.target/riscv/rvv/autovec/pr111391-1.c: New test.
	* gcc.target/riscv/rvv/autovec/pr111391-2.c: New test.