Bruno Cardoso Lopes ef8d6999f3 Add a dag combine to xform 256-bit shuffles into simple vector
inserts and extracts. This simple combine makes us generate only 1
instruction instead of 11 in the v8 case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137362 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-11 21:50:44 +00:00
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