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Summary: The correctness fix here is that when we CSE a load with another load, we need to combine the metadata on the two loads. This matches the behavior of other passes, like instcombine and GVN. There's also a minor optimization improvement here: for load PRE, the aliasing metadata on the inserted load should be the same as the metadata on the original load. Not sure why the old code was throwing it away. Issue found by inspection. Differential Revision: http://reviews.llvm.org/D21460 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277977 91177308-0d34-0410-b5e6-96231b3b80d8