[ADT] Deprecate MutableArrayRef(std::nullopt)#146113

kazutakahirata merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

kazutakahirata:cleanup_20250627_MutableArrayRef_nulloptkazutakahirata/llvm-project:cleanup_20250627_MutableArrayRef_nulloptCopy head branch name to clipboard