LoongArch: Add tests for ASX vector xvand/xvandi/xvandn/xvor/xvori/ xvnor/xvnori/xvxor/xvxori instructions.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/vector/lasx/lasx-xvand.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvandi.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvandn.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvnor.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvnori.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvor.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvori.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvorn.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvxor.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvxori.c: New test.