RISC-V: Add vmadd vx C++ api test
gcc/testsuite/ChangeLog:
* g++.target/riscv/rvv/base/vmadd_vx_mu_rv64-1.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_mu_rv64-2.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_mu_rv64-3.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_rv64-1.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_rv64-2.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_rv64-3.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_tu_rv64-1.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_tu_rv64-2.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_tu_rv64-3.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_tum_rv64-1.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_tum_rv64-2.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_tum_rv64-3.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_tumu_rv64-1.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_tumu_rv64-2.C: New test.
* g++.target/riscv/rvv/base/vmadd_vx_tumu_rv64-3.C: New test.
15 files changed: