AMDGPU/LoadStoreOptimizer: Set the correct offset whem merging MMOs

AMDGPU/LoadStoreOptimizer: Set the correct offset whem merging MMOs

Summary:
This is a follow up to r367237.  MachineFunction::getMachineMemOperand()
adds the offset parameter to the existing offset instead of resetting it.
So we need to reset the offset to the correct value after calling this
function.

Reviewers: arsenm

Subscribers: kzhuravl, jvesely, wdng, nhaehnle, yaxunl, dstuttard, tpr, t-tye, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D65557

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367881 91177308-0d34-0410-b5e6-96231b3b80d8