[X86] Add 128 and 256-bit VPOPCNTDQ instructions. Adjust some tablegen classes LZCNT/POPCNT.

I think when this instruction was first published it was only for a Knights CPU and thus VLX version was missing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320910 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed