RISC-V: Adapt VLS init tests
Realize that init tests are wrong by my previous mistakes.
Fix them and committed.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/rvv/autovec/vls/def.h: Fix init test.
* gcc.target/riscv/rvv/autovec/vls/init-1.c: Ditto.
* gcc.target/riscv/rvv/autovec/vls/init-2.c: Ditto.
* gcc.target/riscv/rvv/autovec/vls/init-3.c: Ditto.
* gcc.target/riscv/rvv/autovec/vls/init-4.c: Ditto.
* gcc.target/riscv/rvv/autovec/vls/init-5.c: Ditto.
* gcc.target/riscv/rvv/autovec/vls/init-6.c: Ditto.
* gcc.target/riscv/rvv/autovec/vls/init-7.c: Ditto.