Revert "[AArch64] Create proper memoperand for multi-vector stores"

This reverts commit r345315, it was causing test failures on
sanitizer-x86_64-linux-fast.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345356 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed