[X86] Attempt to model basic arithmetic instructions in the...

[X86] Attempt to model basic arithmetic instructions in the Haswell/Broadwell/Skylake scheduler models without InstRWs

Summary:
This patch removes InstRW overrides for basic arithmetic/logic instructions. To do this I've added the store address port to RMW. And used a WriteSequence to make the latency additive. It does not cover ADC/SBB because they have different latency.

Apparently we were inconsistent about whether the store has latency or not thus the test changes.

I've also left out Sandy Bridge because the load latency there is currently 4 cycles and should be 5.

Reviewers: RKSimon, andreadb

Reviewed By: andreadb

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D45351

llvm-svn: 329416