[PATCH] RISC-V: Add vsaddu.vv C API tests

From: Ju-Zhe Zhong gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/base/vsaddu_vv-1.c: New test. * gcc.target/riscv/rvv/base/vsaddu_vv-2.c: New test. * gcc.target/riscv/rvv/base/vsaddu_vv-3.c: New test. * gcc.target/riscv/rvv/base/vsaddu_vv_m-1.c: New test.

[PATCH] RISC-V: Add vsaddu.vv C++ API tests.

From: Ju-Zhe Zhong gcc/testsuite/ChangeLog: * g++.target/riscv/rvv/base/vsaddu_vv-1.C: New test. * g++.target/riscv/rvv/base/vsaddu_vv-2.C: New test. * g++.target/riscv/rvv/base/vsaddu_vv-3.C: New test. * g++.target/riscv/rvv/base/vsaddu_vv_mu-1.C: New test.