AVX-512: Implemented DAG lowering for shuff62x2/shufi62x2 instuctions ( Shuffle Packed Values at 128-bit Granularity ) 
Tests added , vector-shuffle-512-v8.ll test re-generated.

Differential Revision: http://reviews.llvm.org/D10300

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239697 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed