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Summary: While scanning predecessors to find an available loaded value, if the predecessor has a single predecessor, we can continue scanning through the single predecessor. Reviewers: mcrosier, rengolin, reames, davidxl, haicheng Reviewed By: rengolin Subscribers: zzheng, llvm-commits Differential Revision: https://reviews.llvm.org/D29200 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293896 91177308-0d34-0410-b5e6-96231b3b80d8