Simon Pilgrim 28f299b62d [X86][AVX2] vpslldq/vpsrldq byte shifts for AVX2
This patch refactors the existing lowerVectorShuffleAsByteShift function to add support for 256-bit vectors on AVX2 targets.

It also fixes a tablegen issue that prevented the lowering of vpslldq/vpsrldq vec256 instructions.

Differential Revision: http://reviews.llvm.org/D7596

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229311 91177308-0d34-0410-b5e6-96231b3b80d8
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