Reapply "[AArch64][SVE] Improve fixed-length addressing modes. (#130263)"#130625

rj-jesus merged 4 commits intollvm:mainllvm/llvm-project:mainfrom

rj-jesus:rjj/aarch64-sve-vls-addressing-modes-fixrj-jesus/llvm-project:rjj/aarch64-sve-vls-addressing-modes-fixCopy head branch name to clipboard