[LoopInterchange] Add some optimization remarks.

Reviewers: anemet, karthikthecool, blitz.opensource

Reviewed By: anemet

Subscribers: mzolotukhin, llvm-commits

Differential Revision: https://reviews.llvm.org/D35122

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308094 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed