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Summary: The SILoadStoreOptimizer can now look ahead more then one instruction when looking for instructions to merge, which greatly improves the number of loads/stores that we are able to merge. Moving the pass before scheduling avoids increasing register pressure after the scheduler, so that the scheduler's register pressure estimates will be more accurate. It also gives more consistent results, since it is no longer affected by minor scheduling changes. Reviewers: arsenm Subscribers: arsenm, kzhuravl, llvm-commits Differential Revision: https://reviews.llvm.org/D23814 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279991 91177308-0d34-0410-b5e6-96231b3b80d8