[PATCH] RISC-V: Add vzext.vf4 C++ API tests

From: Ju-Zhe Zhong gcc/testsuite/ChangeLog: * g++.target/riscv/rvv/base/vzext_vf4-1.C: New test. * g++.target/riscv/rvv/base/vzext_vf4-2.C: New test. * g++.target/riscv/rvv/base/vzext_vf4-3.C: New test. * g++.target/riscv/rvv/base/vzext_vf4_mu-1.C: New test.

[PATCH] RISC-V: Add vzext.vf4 C API tests

From: Ju-Zhe Zhong gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/base/vzext_vf4-1.c: New test. * gcc.target/riscv/rvv/base/vzext_vf4-2.c: New test. * gcc.target/riscv/rvv/base/vzext_vf4-3.c: New test. * gcc.target/riscv/rvv/base/vzext_vf4_m-1.c: New test.