[PATCH] RISC-V: Add vzext.vf8 C++ API tests

From: Ju-Zhe Zhong gcc/testsuite/ChangeLog: * g++.target/riscv/rvv/base/vzext_vf8-1.C: New test. * g++.target/riscv/rvv/base/vzext_vf8-2.C: New test. * g++.target/riscv/rvv/base/vzext_vf8-3.C: New test. * g++.target/riscv/rvv/base/vzext_vf8_mu-1.C: New test.

[PATCH] RISC-V: Add vzext.vf8 C API tests

From: Ju-Zhe Zhong gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/base/vzext_vf8-1.c: New test. * gcc.target/riscv/rvv/base/vzext_vf8-2.c: New test. * gcc.target/riscv/rvv/base/vzext_vf8-3.c: New test. * gcc.target/riscv/rvv/base/vzext_vf8_m-1.c: New test.