RISC-V: Add VLS conditional patterns support

RISC-V: Add VLS conditional patterns support

Regression passed.

Committed.

gcc/ChangeLog:

	* config/riscv/autovec.md: Add VLS conditional patterns.
	* config/riscv/riscv-protos.h (expand_cond_unop): Ditto.
	(expand_cond_binop): Ditto.
	(expand_cond_ternop): Ditto.
	* config/riscv/riscv-v.cc (expand_cond_unop): Ditto.
	(expand_cond_binop): Ditto.
	(expand_cond_ternop): Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/vls/def.h: Add VLS conditional tests.
	* gcc.target/riscv/rvv/autovec/vls/cond_add-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_add-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_and-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_div-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_div-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_fma-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_fma-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_fms-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_fnma-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_fnma-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_fnms-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_ior-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_max-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_max-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_min-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_min-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_mod-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_mul-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_mul-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_neg-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_neg-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_not-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_shift-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_shift-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_sub-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_sub-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/cond_xor-1.c: New test.