LoongArch: Add tests for ASX vector xvfcmp{caf/ceq/cle/clt/cne/cor/cun} instructions.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/vector/lasx/lasx-xvfcmp_caf_s.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvfcmp_ceq_s.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvfcmp_cle_s.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvfcmp_clt_s.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvfcmp_cne_s.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvfcmp_cor_s.c: New test.
* gcc.target/loongarch/vector/lasx/lasx-xvfcmp_cun_s.c: New test.