[PostRAMachineSink] preserve CFG

Summary: Mark CFG is preserved  since this pass do not make any change in CFG.

Reviewers: sebpop, mzolotukhin, mcrosier

Reviewed By: mzolotukhin

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D44845

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328727 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed