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d821e0a5cc
LLVM ToT produces poor MMX code compared to 3.5. However, part of the previous functionality can be achieved by using -x86-experimental-vector-widening-legalization. Add tests to be sure we don't regress again. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227869 91177308-0d34-0410-b5e6-96231b3b80d8