This patch would like to support the FP llrint auto vectorization.
* long long llrint (double)
This will be the CVT from DF => DI from the standard name's perpsective,
which has been covered in previous PATCH(es). Thus, this patch only add
some test cases.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/rvv/autovec/unop/test-math.h: Add type int64_t.
* gcc.target/riscv/rvv/autovec/unop/math-llrint-0.c: New test.
* gcc.target/riscv/rvv/autovec/unop/math-llrint-run-0.c: New test.
* gcc.target/riscv/rvv/autovec/vls/math-llrint-0.c: New test.