[X86] Add test cases for reciprocal estimation for v16f32 vectors with AVX512F.

We should be able to use the vrsqrt14ps and vrcp14ps instructions for these cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331605 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed