[DominatorTree] Add support for mixed pre/post CFG views.

Add support for mixed pre/post CFG views.

Update usages of the MemorySSAUpdater to use the new DT API by
requesting the DT updates to be done by the MSSAUpdater.

Differential Revision: https://reviews.llvm.org/D93371

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp b/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp
index 68435c2..eb7018c 100644
--- a/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp
+++ b/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp
@@ -498,12 +498,13 @@ bool LoopRotate::rotateLoop(Loop *L, bool SimplifiedLatch) {
       Updates.push_back({DominatorTree::Insert, OrigPreheader, Exit});
       Updates.push_back({DominatorTree::Insert, OrigPreheader, NewHeader});
       Updates.push_back({DominatorTree::Delete, OrigPreheader, OrigHeader});
-      DT->applyUpdates(Updates);
 
       if (MSSAU) {
-        MSSAU->applyUpdates(Updates, *DT);
+        MSSAU->applyUpdates(Updates, *DT, /*UpdateDT=*/true);
         if (VerifyMemorySSA)
           MSSAU->getMemorySSA()->verifyMemorySSA();
+      } else {
+        DT->applyUpdates(Updates);
       }
     }