[AArch64LoadStoreOptimizer] Check aliasing correctly when creating paired loads/stores.

The existing code accidentally skipped the aliasing check in edge cases.

Differential revision: https://reviews.llvm.org/D23372



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278562 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed