RISC-V: Postpone full available optimization [VSETVL PASS]

RISC-V: Postpone full available optimization [VSETVL PASS]

Fix VSETVL BUG that AVL is polluted

.L15:
        li      a3,9
        lui     a4,%hi(s)
        sw      a3,%lo(j)(t2)
        sh      a5,%lo(s)(a4) <--a4 is hold the address of s
        beq     t0,zero,.L42
        sw      t5,8(t4)
        vsetvli zero,a4,e8,m8,ta,ma  <<--- a4 as avl

Actually, this vsetvl is redundant.
The root cause we include full available optimization in LCM local data computation.

full available optimization should be after LCM computation.

	PR target/112929
	PR target/112988

gcc/ChangeLog:

	* config/riscv/riscv-vsetvl.cc
	(pre_vsetvl::compute_lcm_local_properties): Remove full available.
	(pre_vsetvl::pre_global_vsetvl_info): Add full available optimization.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/vsetvl/pr112929.c: New test.
	* gcc.target/riscv/rvv/vsetvl/pr112988.c: New test.