LoongArch: Add tests for SX vector vssran/vssrani/vssrarn/vssrarni/vssrln /vssrlni/vssrlrn/vssrlrni instructions.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/vector/lsx/lsx-vssran.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vssrani.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vssrarn.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vssrarni.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vssrln.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vssrlni.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vssrlrn.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vssrlrni.c: New test.