MC Helpers for llvm-cfi-verify.

Add instruction analysis and machinecode traversal helpers in
preparation for control flow graph generation implementation.

Reviewers: vlad.tsyrklevich

Reviewed By: vlad.tsyrklevich

Subscribers: mgorny, llvm-commits, pcc, kcc

Differential Revision: https://reviews.llvm.org/D38424

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315528 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed