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This extends the same line of reasoning used in EarlyCSE w/http://reviews.llvm.org/D15352 to the DSE implementation in InstCombine. Key points: * We only remove unordered or simple stores. * The loads producing values consumed by dead stores don't influence whether the store is dead. Differential Revision: http://reviews.llvm.org/D15354 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255932 91177308-0d34-0410-b5e6-96231b3b80d8
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