[RISCV] Handle more cases when combining (vfmv.s.f (extract_subvector X, 0))#154175

mshockwave merged 3 commits intollvm:mainllvm/llvm-project:mainfrom

mshockwave:patch/rvv/redundant-vmv_s_f-eliminationmshockwave/llvm-project:patch/rvv/redundant-vmv_s_f-eliminationCopy head branch name to clipboard