[X86] Add sched class WriteLAHFSAHF and fix values.

Summary:
I ran llvm-exegesis on SKX, SKL, BDW, HSW, SNB.
Atom is from Agner and SLM is a guess.
I've left AMD processors alone.

Reviewers: RKSimon, craig.topper

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D48079

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335097 91177308-0d34-0410-b5e6-96231b3b80d8