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896749ca40
Turning a table lookup intrinsic into a shuffle vector instruction
can be beneficial. If the mask used for the lookup is the constant
vector {7,6,5,4,3,2,1,0}, then the back-end generates byte reverse
instructions instead.
Differential Revision: https://reviews.llvm.org/D46133
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333550 91177308-0d34-0410-b5e6-96231b3b80d8