[LangRef] Clarify in vscale_range that vscale is a power-of-two without the attribute#183689

lukel97 merged 2 commits intollvm:mainllvm/llvm-project:mainfrom

lukel97:langref/vscale_range-power-of-twolukel97/llvm-project:langref/vscale_range-power-of-twoCopy head branch name to clipboard