[AArch64] Improve bcvtn2 and remove aarch64_neon_bfcvt intrinsics#120363

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

davemgreen:gh-a64-bfcvtn2davemgreen/llvm-project:gh-a64-bfcvtn2Copy head branch name to clipboard