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The current way that trivial addressing modes are detected incorrectly thinks that null pointers are non-trivial, leading to an infinite loop where we keep duplicating the same select. Fix this by aware of null when deciding if an addressing mode is trivial. Differential Revision: https://reviews.llvm.org/D40447 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319019 91177308-0d34-0410-b5e6-96231b3b80d8