[PATCH] RISC-V: Add vzext.vf2 C++ API tests

From: Ju-Zhe Zhong gcc/testsuite/ChangeLog: * g++.target/riscv/rvv/base/vzext_vf2-1.C: New test. * g++.target/riscv/rvv/base/vzext_vf2-2.C: New test. * g++.target/riscv/rvv/base/vzext_vf2-3.C: New test. * g++.target/riscv/rvv/base/vzext_vf2_mu-1.C: New test.

[PATCH] RISC-V: Add vzext.vf2 C API tests

From: Ju-Zhe Zhong gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/base/vzext_vf2-1.c: New test. * gcc.target/riscv/rvv/base/vzext_vf2-2.c: New test. * gcc.target/riscv/rvv/base/vzext_vf2-3.c: New test. * gcc.target/riscv/rvv/base/vzext_vf2_m-1.c: New test.