[X86][SkylakeServer] Correct throughput for 512-bit sqrt and divide.

Data taken from the AVX512_SKX_PortAssign spreadsheet at http://instlatx64.atw.hu/

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328961 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed