[JumpThread] Enhance finding partial redundant loads by continuing scanning single predecessor
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
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