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AMDGPU/SILoadStoreOptimizer: fix a likely bug introduced recently
Summary: We should check for same instruction class before checking whether they have the same base address, else we might iterate out of bounds of a MachineInstr operands list. The InstClass check is also cheaper. This was introduced in SVN r373630. Reviewers: tstellar Subscribers: arsenm, kzhuravl, jvesely, wdng, yaxunl, dstuttard, tpr, t-tye, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68690
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