add -mattr=+v to G_AND test cases

Author: jiahanxie353

llvm/test/CodeGen/RISCV/GlobalISel/legalizer/rvv/legalize-and.mir

@@ -1,6 +1,6 @@
 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
-# RUN: llc -mtriple=riscv32 -run-pass=legalizer %s -o - | FileCheck %s
-# RUN: llc -mtriple=riscv64 -run-pass=legalizer %s -o - | FileCheck %s
+# RUN: llc -mtriple=riscv32 -mattr=+v -run-pass=legalizer %s -o - | FileCheck %s
+# RUN: llc -mtriple=riscv64 -mattr=+v -run-pass=legalizer %s -o - | FileCheck %s
 ---
 name:  test_nxv1s8
 body:   |