[LoopRotate][Dominators] Use the incremental API to update DomTree

Summary: This patch teaches LoopRotate to use the new incremental API to update the DominatorTree.

Reviewers: dberlin, davide, grosser, sanjoy

Reviewed By: dberlin, davide

Subscribers: hiraditya, llvm-commits, mzolotukhin

Differential Revision: https://reviews.llvm.org/D35581

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311125 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed