[llvm-exegesis] Provide a way to handle memory instructions.

Summary:
And implement memory instructions on X86.

This fixes PR36906.

Reviewers: gchatelet

Reviewed By: gchatelet

Subscribers: lebedev.ri, filcab, mgorny, tschuett, RKSimon, llvm-commits

Differential Revision: https://reviews.llvm.org/D48935

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338567 91177308-0d34-0410-b5e6-96231b3b80d8
20 files changed