AMDGPU: Use MachineInstr::mayAlias to replace areMemAccessesTriviallyDisjoint in LoadStoreOptimizer pass.

Summary:
  This is to fix a memory dependence bug in LoadStoreOptimizer.

Reviewers:
  arsenm, rampitec

Differential Revision:
  https://reviews.llvm.org/D58295

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354295 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed