[x86][AVX512] Lowering shuffle i/f intrinsics to LLVM IR

This patch, together with a matching clang patch (https://reviews.llvm.org/D38672), implements the lowering of X86 shuffle i/f intrinsics to IR.

Differential Revision: https://reviews.llvm.org/D38671

Change-Id: I1e7d359a74743e995ec356237a85214ce55d3661

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318026 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed