LoongArch: Add tests for SX vector vrotr/vrotri/vsra/vsrai/vsran/vsrani /vsrarn/vsrarni instructions.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/vector/lsx/lsx-vrotr.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vrotri.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vsra.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vsrai.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vsran.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vsrani.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vsrar.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vsrari.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vsrarn.c: New test.
* gcc.target/loongarch/vector/lsx/lsx-vsrarni.c: New test.