[Clang][Builtin][AVX512]Adding k-register logic intrinsics KAND, KANDN, KOR,...

[Clang][Builtin][AVX512]Adding k-register logic intrinsics KAND, KANDN, KOR, KORTEST, KXNOR, KXOR, KUNPACK instruction set.

Differential Revision: http://reviews.llvm.org/D19466



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@267425 91177308-0d34-0410-b5e6-96231b3b80d8