RISC-V: Support full coverage VLS combine support

RISC-V: Support full coverage VLS combine support

Support full coverage VLS combine support.

Committed.

gcc/ChangeLog:

	* config/riscv/autovec-opt.md: Extend VLS modes
	* config/riscv/vector-iterators.md: Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/vls/def.h:
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-10.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-11.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-12.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-3.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-4.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-5.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-6.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-7.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-8.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_convert-9.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_copysign-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_ext-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_ext-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_ext-3.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_ext-4.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_ext-5.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_mulh-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_narrow-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_narrow-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_trunc-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_trunc-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_trunc-3.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_trunc-4.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_trunc-5.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wadd-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wadd-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wadd-3.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wadd-4.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wfma-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wfma-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wfms-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wfnma-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wmul-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wmul-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wmul-3.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wsub-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wsub-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wsub-3.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_wsub-4.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/narrow-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/narrow-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/narrow-3.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/wred-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/wred-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/wred-3.c: New test.

(cherry picked from commit e4aa1a49010fb55f3e90731464d21b05baeb6855)