Add AVX2 intrinsics for pavg, pblend, and pcmp instructions. Also remove unneeded builtins for SSE pcmp. Change SSE pcmpeqq and pcmpgtq to not use builtins and just use vector == and >.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146969 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed