RISC-V: Fix VLMAX AVL incorrect local anticipate [VSETVL PASS]

Realize we have a bug in VSETVL PASS which is triggered by strided_load_run-1.c in RV32 system.

FAIL: gcc.target/riscv/rvv/autovec/gather-scatter/strided_load_run-1.c execution test
FAIL: gcc.target/riscv/rvv/autovec/gather-scatter/strided_load_run-1.c execution test
FAIL: gcc.target/riscv/rvv/autovec/gather-scatter/strided_load_run-1.c execution test
FAIL: gcc.target/riscv/rvv/autovec/gather-scatter/strided_load_run-1.c execution test

This is because VSETVL PASS incorrect hoist vsetvl instruction:

...
   10156:	0d9075d7          	vsetvli	a1,zero,e64,m2,ta,ma ---> pollute 'a1' register which will be used by following insns.
   1015a:	01d586b3          	add	a3,a1,t4  --------> use 'a1'
   1015e:	5e070257          	vmv.v.v	v4,v14
   10162:	b7032257          	vmacc.vv	v4,v6,v16
   10166:	26440257          	vand.vv	v4,v4,v8
   1016a:	22880227          	vs2r.v	v4,(a6)
   1016e:	00b6b7b3          	sltu	a5,a3,a1
   10172:	22888227          	vs2r.v	v4,(a7)
   10176:	9e60b157          	vmv2r.v	v2,v6
   1017a:	97ba                	add	a5,a5,a4
   1017c:	a6a62157          	vmadd.vv	v2,v12,v10
   10180:	26240157          	vand.vv	v2,v2,v8
   10184:	22830127          	vs2r.v	v2,(t1)
   10188:	873e                	mv	a4,a5
   1018a:	982a                	add	a6,a6,a0
   1018c:	98aa                	add	a7,a7,a0
   1018e:	932a                	add	t1,t1,a0
   10190:	85b6                	mv	a1,a3       -----> set 'a1'
...

gcc/ChangeLog:

	* config/riscv/riscv-vsetvl.cc (anticipatable_occurrence_p):
	Fix incorrect anticipate info.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/vsetvl/vlmax_back_prop-1.c: Adjust tests.
	* gcc.target/riscv/rvv/vsetvl/vlmax_back_prop-2.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vlmax_back_prop-24.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vlmax_back_prop-25.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vlmax_back_prop-26.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vlmax_back_prop-3.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vlmax_back_prop-36.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vlmax_back_prop-4.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vlmax_conflict-7.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vlmax_switch_vtype-14.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vlmax_switch_vtype-15.c: Ditto.
	* gcc.target/riscv/rvv/vsetvl/vlmax_switch_vtype-16.c: Ditto.