368681f803
According to the LLVM debug info update guide: https://llvm.org/docs/HowToUpdateDebugInfo.html, "Hoisting identical instructions which appear in several successor blocks into a predecessor block. In this case there is no single merged instruction. The rule for dropping locations applies". Thanks to Yuanbo Li for reporting this. Reviewed By: dblaikie Reviewers: sebpop, tejohnson, dblaikie Differential Revision: https://reviews.llvm.org/D122730