[Clang][AArch64]Remove _single from vg2x1 and vg4x1 svmla#166799

CarolineConcatto wants to merge 2 commits intollvm:mainllvm/llvm-project:mainfrom

CarolineConcatto:fp8_mla_fix_clangCarolineConcatto/llvm-project:fp8_mla_fix_clangCopy head branch name to clipboard