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c57e90422f
addition to lowering to trees rooted in an unpack. This saves shuffles and or registers in many various ways, lets us handle another class of v4i32 shuffles pre SSE4.1 without domain crosses, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229856 91177308-0d34-0410-b5e6-96231b3b80d8
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